Container with DecorationImage does not honor Blendmode

I'm using the master channel. My code was working great last week but since the latest update, my rendered image has changed. I'm using a `Container` with a `BoxDecoration` that includes a color with opacity and an image. The blend mode applied is `BlendMode.color`. 

![image](https://user-images.githubusercontent.com/25512495/68603782-003f7700-0477-11ea-9b1a-f63b618cd2aa.png)


## Steps to Reproduce

1. Update Flutter SDK to the latest master version
2. See the difference (screenshot)
3. Code:

``` dart
Container(
    decoration: BoxDecoration(
    color: Colors.black.withOpacity(0.6),
    backgroundBlendMode: BlendMode.color,
    image: DecorationImage(
            image: NetworkImage(VRoomConfig.activityCoverUrl),
            fit: BoxFit.cover,
        ),
    ),
    child: ...
```

**Target Platform: Web**
**Target OS version/browser: Chrome 78.0.3904.97 (64 bits)**


## Logs
### flutter run --verbose
```
[  +22 ms] executing: [D:\_utils\Flutter\] git -c log.showSignature=false log -n 1 --pretty=format:%H
[  +65 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] e7073f9a1f5c40398f589ae45956b489b1f3ab10
[        ] executing: [D:\_utils\Flutter\] git describe --match v*.*.* --first-parent --long --tags
[  +68 ms] Exit code 0 from: git describe --match v*.*.* --first-parent --long --tags
[        ] v1.10.15-113-ge7073f9a1
[   +5 ms] executing: [D:\_utils\Flutter\] git rev-parse --abbrev-ref --symbolic @{u}
[  +46 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/master
[        ] executing: [D:\_utils\Flutter\] git ls-remote --get-url origin
[  +43 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[  +73 ms] executing: [D:\_utils\Flutter\] git rev-parse --abbrev-ref HEAD
[  +45 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] master
[  +83 ms] executing: C:\Users\nicolas.dion\AppData\Local\Android\Sdk\platform-tools\adb.exe devices -l
[  +97 ms] Exit code 0 from: C:\Users\nicolas.dion\AppData\Local\Android\Sdk\platform-tools\adb.exe devices -l
[        ] List of devices attached
[   +8 ms] More than one device connected; please specify a device with the '-d <deviceId>' flag, or use '-d all' to act on all devices.
[  +37 ms] Chrome     • chrome     • web-javascript • Google Chrome 78.0.3904.97
[   +1 ms] Web Server • web-server • web-javascript • Flutter Tools
[   +7 ms] "flutter run" took 281ms.

#0      throwToolExit (package:flutter_tools/src/base/common.dart:28:3)
#1      RunCommand.validateCommand (package:flutter_tools/src/commands/run.dart:289:7)
<asynchronous suspension>
#2      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:545:11)
<asynchronous suspension>
#3      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:470:33)
<asynchronous suspension>
#4      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:146:29)
<asynchronous suspension>
#5      _rootRun (dart:async/zone.dart:1124:13)
#6      _CustomZone.run (dart:async/zone.dart:1021:19)
#7      _runZoned (dart:async/zone.dart:1516:10)
#8      runZoned (dart:async/zone.dart:1463:12)
#9      AppContext.run (package:flutter_tools/src/base/context.dart:145:18)
<asynchronous suspension>
#10     FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:460:20)
#11     CommandRunner.runCommand (package:args/command_runner.dart:197:27)
<asynchronous suspension>
#12     FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:416:21)
<asynchronous suspension>
#13     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:146:29)
<asynchronous suspension>
#14     _rootRun (dart:async/zone.dart:1124:13)
#15     _CustomZone.run (dart:async/zone.dart:1021:19)
#16     _runZoned (dart:async/zone.dart:1516:10)
#17     runZoned (dart:async/zone.dart:1463:12)
#18     AppContext.run (package:flutter_tools/src/base/context.dart:145:18)
<asynchronous suspension>
#19     FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:367:19)
<asynchronous suspension>
#20     CommandRunner.run.<anonymous closure> (package:args/command_runner.dart:112:25)
#21     new Future.sync (dart:async/future.dart:222:31)
#22     CommandRunner.run (package:args/command_runner.dart:112:14)
#23     FlutterCommandRunner.run (package:flutter_tools/src/runner/flutter_command_runner.dart:251:18)
#24     run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:63:22)
<asynchronous suspension>
#25     _rootRun (dart:async/zone.dart:1124:13)
#26     _CustomZone.run (dart:async/zone.dart:1021:19)
#27     _runZoned (dart:async/zone.dart:1516:10)
#28     runZoned (dart:async/zone.dart:1500:12)
#29     run.<anonymous closure> (package:flutter_tools/runner.dart:61:18)
<asynchronous suspension>
#30     AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:146:29)
<asynchronous suspension>
#31     _rootRun (dart:async/zone.dart:1124:13)
#32     _CustomZone.run (dart:async/zone.dart:1021:19)
#33     _runZoned (dart:async/zone.dart:1516:10)
#34     runZoned (dart:async/zone.dart:1463:12)
#35     AppContext.run (package:flutter_tools/src/base/context.dart:145:18)
<asynchronous suspension>
#36     runInContext (package:flutter_tools/src/context_runner.dart:65:24)
<asynchronous suspension>
#37     run (package:flutter_tools/runner.dart:50:10)
#38     main (package:flutter_tools/executable.dart:65:9)
<asynchronous suspension>
#39     main (file:///D:/_utils/Flutter/packages/flutter_tools/bin/flutter_tools.dart:8:3)
#40     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:303:32)
#41     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
```

### flutter analyse
```
   info - Unused import: 'package:live_app/widgets/icons/app_icons_cheatsheet.dart' - lib\app\vroom\vroom_app.dart:10:8 - unused_import
   info - The value of the field '_iceServers' isn't used - lib\managers\stream\webrtc\base_webrtc_peer.dart:30:17 - unused_field
   info - The value of the field '_mediaConstraints' isn't used - lib\managers\stream\webrtc\base_webrtc_peer.dart:58:24 - unused_field
   info - The declaration '_onGetStreamSuccess' isn't referenced - lib\managers\stream\webrtc\base_webrtc_peer.dart:117:8 - unused_element
   info - The declaration '_getDisplayMedia' isn't referenced - lib\managers\stream\webrtc\base_webrtc_peer.dart:273:8 - unused_element
   info - The declaration '_PanelHeader' isn't referenced - lib\screens\vroom\panels\panel_base.dart:293:7 - unused_element
   info - This function has a return type of 'Map<String, dynamic>', but doesn't end with a return statement - lib\util\webrtc\webrtc.dart:45:31 - missing_return
   info - This function has a return type of 'Map<String, dynamic>', but doesn't end with a return statement - lib\util\webrtc\webrtc.dart:46:31 - missing_return
   info - This function has a return type of 'Future<List>', but doesn't end with a return statement - lib\util\webrtc\webrtc.dart:49:32 - missing_return
   info - This function has a return type of 'Future<List>', but doesn't end with a return statement - lib\util\webrtc\webrtc.dart:50:32 - missing_return
   info - This function has a return type of 'Future<List>', but doesn't end with a return statement - lib\util\webrtc\webrtc.dart:51:32 - missing_return
   info - Unused import: 'package:live_app/managers/network/connection_status.dart' - test\app\vroom\vroom_app_test.dart:5:8 - unused_import
   info - Unused import: 'package:live_app/core/base_core.dart' - test\core\base_core_test.dart:1:8 - unused_import
   info - Unused import: 'package:live_app/managers/chat/chat_manager.dart' - test\core\base_core_test.dart:2:8 - unused_import
   info - Unused import: 'package:live_app/managers/login/server_info_step.dart' - test\core\base_core_test.dart:3:8 - unused_import
   info - Unused import: 'package:live_app/managers/network/hub_error.dart' - test\core\base_core_test.dart:5:8 - unused_import
   info - Unused import: 'package:test/test.dart' - test\core\base_core_test.dart:9:8 - unused_import
   info - `Future` results in `async` function bodies must be `await`ed or marked `unawaited` using `package:pedantic` - test\main_test.dart:19:7 - unawaited_futures
   info - `Future` results in `async` function bodies must be `await`ed or marked `unawaited` using `package:pedantic` - test_driver\app_test.dart:21:9 - unawaited_futures
```


### flutter doctor
```
[√] Flutter (Channel master, v1.10.16-pre.113, on Microsoft Windows [version 10.0.18362.418], locale fr-CA)
    • Flutter version 1.10.16-pre.113 at D:\_utils\Flutter
    • Framework revision e7073f9a1f (2 days ago), 2019-11-09 17:08:53 -0800
    • Engine revision 31cd2dfca2
    • Dart version 2.7.0

[!] Android toolchain - develop for Android devices (Android SDK version 29.0.0)
    • Android SDK at C:\Users\nicolas.dion\AppData\Local\Android\Sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.0
    • ANDROID_HOME = C:\Users\nicolas.dion\AppData\Local\Android\Sdk
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[!] Android Studio (version 3.4)
    • Android Studio at C:\Program Files\Android\Android Studio
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[!] IntelliJ IDEA Ultimate Edition (version 2016.3)
    • IntelliJ at C:\Program Files (x86)\JetBrains\IntelliJ IDEA 2016.3.8
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins
    X This install is older than the minimum recommended version of 2017.1.0.

[!] IntelliJ IDEA Ultimate Edition (version 2019.2)
    • IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2019.2
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins

[√] VS Code, 64-bit edition (version 1.39.2)
    • VS Code at C:\Program Files\Microsoft VS Code
    • Flutter extension version 3.6.0

[√] Connected device (2 available)
    • Chrome     • chrome     • web-javascript • Google Chrome 78.0.3904.97
    • Web Server • web-server • web-javascript • Flutter Tools

! Doctor found issues in 4 categories.
```


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Container with DecorationImage does not honor Blendmode #44585

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Container with DecorationImage does not honor Blendmode #44585

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