Repository: flutter
Issue: [Flutter Web] shows blank page, no errors in chrome console and flutter console
Labels: c: regression,engine,platform-windows,a: first hour,a: debugging,platform-web,P2,team-web,triaged-web

I am new to flutter web. I am using the default counter program. But, I get blank page in chrome and there are no errors in chrome console and flutter console.
## Logs

### flutter run -d chrome:

```
Launching lib\main.dart on Chrome in debug mode...
Syncing files to device Chrome...
16,903ms (!)

### flutter run -d chrome -v
[ +219 ms] executing: [E:\Softwares\flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[ +147 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[   +1 ms] ce55e42f2b6d1f174a4e6326bb19d4af971301be
[   +1 ms] executing: [E:\Softwares\flutter/] git tag --contains HEAD
[ +312 ms] Exit code 0 from: git tag --contains HEAD
[   +3 ms] executing: [E:\Softwares\flutter/] git describe --match *.*.*-*.*.pre --first-parent --long --tags
[  +98 ms] Exit code 0 from: git describe --match *.*.*-*.*.pre --first-parent --long --tags
[   +1 ms] 1.20.0-7.0.pre-80-gce55e42f2
[  +13 ms] executing: [E:\Softwares\flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[ +115 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[   +1 ms] origin/master
[   +1 ms] executing: [E:\Softwares\flutter/] git ls-remote --get-url origin
[  +81 ms] Exit code 0 from: git ls-remote --get-url origin
[   +1 ms] https://github.com/flutter/flutter.git
[ +490 ms] executing: [E:\Softwares\flutter/] git rev-parse --abbrev-ref HEAD
[  +84 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] master
[ +118 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +7 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[  +27 ms] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[   +1 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[  +31 ms] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +48 ms] executing: E:\Softwares\sdk\platform-tools\adb.exe devices -l
[ +149 ms] List of devices attached
[  +11 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[   +9 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[  +22 ms] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +5 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[+2018 ms] Generating E:\Personal_Project\attempt\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[ +208 ms] Launching lib\main.dart on Chrome in debug mode...
[ +222 ms] Updating assets
[+4835 ms] Syncing files to device Chrome...
[ +152 ms] Generating E:\Personal_Project\attempt\android\app\src\main\java\io\flutter\plugins\GeneratedPluginRegistrant.java
[  +99 ms] <- reset
[  +12 ms] E:\Softwares\flutter\bin\cache\dart-sdk\bin\dart.exe --disable-dart-dev
E:\Softwares\flutter\bin\cache\artifacts\engine\windows-x64\frontend_server.dart.snapshot --sdk-root E:\Softwares\flutter\bin\cache\flutter_web_sdk/   
--incremental --target=dartdevc --debugger-module-names --experimental-emit-debug-metadata -Ddart.developer.causal_async_stacks=true --output-dill     
C:\Users\Arjun\AppData\Local\Temp\flutter_tools.291f60d8\flutter_tool.8885aaa0\app.dill --libraries-spec
file:///E:/Softwares/flutter/bin/cache/flutter_web_sdk/libraries.json --packages .packages -Ddart.vm.profile=false -Ddart.vm.product=false
--bytecode-options=source-positions,local-var-info,debugger-stops,instance-field-initializers,keep-unreachable-code,avoid-closure-call-instructions    
--enable-asserts --track-widget-creation --filesystem-root C:\Users\Arjun\AppData\Local\Temp\flutter_tools.291f60d8\flutter_tools.945f70a3
--filesystem-scheme org-dartlang-app --initialize-from-dill build\cache.dill.track.dill --platform
file:///E:/Softwares/flutter/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk.dill
[  +58 ms] <- compile org-dartlang-app:/web_entrypoint.dart
[+31558 ms] Syncing files to device Chrome... (completed in 31,867ms, longer than expected)
[   +1 ms] Synced 23.7MB.
[   +1 ms] <- accept
[   +1 ms] Caching compiled dill
[+4734 ms] [CHROME]:
[   +2 ms] [CHROME]:DevTools listening on ws://127.0.0.1:57598/devtools/browser/5f326541-6e8b-445d-91e2-31c872b346f2
```

### flutter doctor -v

```
[√] Flutter (Channel master, 1.20.0-8.0.pre.80, on Microsoft Windows [Version 10.0.18362.900], locale en-IN)
    • Flutter version 1.20.0-8.0.pre.80 at E:\Softwares\flutter
    • Framework revision ce55e42f2b (5 hours ago), 2020-07-14 07:40:29 -0400
    • Engine revision 1e23309a38
    • Dart version 2.9.0 (build 2.9.0-21.0.dev f997d62a6d)

 
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.1)
    • Android SDK at E:\Softwares\sdk
    • Platform android-30, build-tools 30.0.1
    • ANDROID_HOME = E:\Softwares\sdk
    • Java binary at: E:\Softwares\Android\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 4.0)
    • Android Studio at E:\Softwares\Android
    • Flutter plugin version 47.1.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Connected device (3 available)
    • Web Server (web)  • web-server • web-javascript • Flutter Tools
    • Chrome (web)      • chrome     • web-javascript • Google Chrome 83.0.4103.116
    • Edge (web)        • edge       • web-javascript • Microsoft Edge 83.0.478.61
```

Please see the issue and reply ASAP.....