Repository: flutter
Issue: [Web] RawKeyboardListener does not return correct data
Labels: a: text input,team,framework,platform-web,P2,c: tech-debt,team: skip-test,team-web,triaged-web

## Steps to Reproduce

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Gist of code to reproduce the problem:
https://gist.github.com/mjeffw/8f3f57d23b596fde3c1a8dac93a64549

1. Create a flutter web app with a TextField wrapped by a RawKeyboardListener
2. In the onKey callback, check for a specific key using the following code: `if (value.logicalKey == LogicalKeyboardKey.keyA) print('A');`
3. Run the web app and type the expected key. It never matches. 

If I print the logicalKey value of the RawKeyEvent, and type the letter 'A', here is the output:

```
dart_sdk.js:18740 LogicalKeyboardKey#00039(keyId: "0x00000039", keyLabel: "9", debugName: "Digit 9")
dart_sdk.js:18740 LogicalKeyboardKey#f1dc1(keyId: "0x1000c018a", keyLabel: null, debugName: "Launch Mail")
dart_sdk.js:18740 LogicalKeyboardKey#f1dc1(keyId: "0x1000c018a", keyLabel: null, debugName: "Launch Mail")
dart_sdk.js:18740 LogicalKeyboardKey#00039(keyId: "0x00000039", keyLabel: "9", debugName: "Digit 9")
```

## Logs

<!--
      Run your application with `flutter run --verbose` and attach all the
      log output below between the lines with the backticks. If there is an
      exception, please see if the error message includes enough information
      to explain how to solve the issue.
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```
Jeffs-MacBook-Pro-2:flutter_web_rawkeyboardlistener_example jeff$ webdev serve --verbose
[INFO] Connecting to the build daemon...
[INFO] Generating build script...
[INFO] Generating build script completed, took 401ms
[INFO] 
[INFO] Starting daemon...
[INFO]BuildDefinition: Initializing inputs
[INFO]BuildDefinition: Reading cached asset graph...
[WARNING]BuildDefinition: Throwing away cached asset graph due to Dart SDK update.
[INFO]BuildDefinition: Cleaning up outputs from previous builds....
[INFO]BuildDefinition: Cleaning up outputs from previous builds. completed, took 136ms

[INFO] Generating build script...
[INFO] Generating build script completed, took 109ms
[INFO] 
[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 12.4s
[INFO] 
[INFO] Starting daemon...
[INFO]BuildDefinition: Initializing inputs
[INFO]BuildDefinition: Building new asset graph...
[INFO]BuildDefinition: Building new asset graph completed, took 1.5s

[INFO]BuildDefinition: Checking for unexpected pre-existing outputs....
[INFO]BuildDefinition: Checking for unexpected pre-existing outputs. completed, took 2ms

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 1.5s
[INFO] 
[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 2ms
[INFO] 
[INFO] Setting up file watchers...
[INFO] Setting up file watchers completed, took 4ms
[INFO] 
[INFO] Registering build targets...
[INFO] Starting initial build...
[INFO] Starting resource servers...
[INFO] Serving `web` on http://127.0.0.1:8080

[INFO] About to build [web]...
[INFO]Build: Running build...
[INFO]Heartbeat: 1.0s elapsed, 89/108 actions completed.
[INFO]Heartbeat: 2.0s elapsed, 285/303 actions completed.
[INFO]Heartbeat: 3.1s elapsed, 517/537 actions completed.
[INFO]Heartbeat: 4.2s elapsed, 694/726 actions completed.
[INFO]Heartbeat: 5.3s elapsed, 694/726 actions completed.
[INFO]Heartbeat: 6.4s elapsed, 705/741 actions completed.
[INFO]Heartbeat: 7.4s elapsed, 716/750 actions completed.
[INFO]Heartbeat: 8.5s elapsed, 720/752 actions completed.
[INFO]Heartbeat: 9.5s elapsed, 722/752 actions completed.
[INFO]Heartbeat: 10.6s elapsed, 726/754 actions completed.
[INFO]Heartbeat: 11.6s elapsed, 731/754 actions completed.
[INFO]Heartbeat: 12.7s elapsed, 734/754 actions completed.
[INFO]Heartbeat: 13.8s elapsed, 737/754 actions completed.
[INFO]Heartbeat: 14.8s elapsed, 739/754 actions completed.
[INFO]Heartbeat: 15.8s elapsed, 740/754 actions completed.
[INFO]Heartbeat: 16.9s elapsed, 740/754 actions completed.
[INFO]Heartbeat: 17.9s elapsed, 742/754 actions completed.
[INFO]Heartbeat: 18.9s elapsed, 743/754 actions completed.
[INFO]Heartbeat: 20.0s elapsed, 744/754 actions completed.
[INFO]Heartbeat: 21.0s elapsed, 745/754 actions completed.
[INFO]Heartbeat: 22.1s elapsed, 748/754 actions completed.
[INFO]Heartbeat: 23.1s elapsed, 750/754 actions completed.
[INFO]Heartbeat: 24.2s elapsed, 750/754 actions completed.
[INFO]Heartbeat: 25.3s elapsed, 752/754 actions completed.
[INFO]Heartbeat: 26.3s elapsed, 752/754 actions completed.
[INFO]Heartbeat: 27.4s elapsed, 752/754 actions completed.
[INFO]Heartbeat: 28.4s elapsed, 752/754 actions completed.
[INFO]Heartbeat: 29.5s elapsed, 752/754 actions completed.
[INFO]Heartbeat: 30.5s elapsed, 754/754 actions completed.
[INFO]Build: Running build completed, took 30.9s

[INFO]Build: Caching finalized dependency graph...
[INFO]Build: Caching finalized dependency graph completed, took 197ms

[INFO]Build: Succeeded after 31.1s with 560 outputs (3266 actions)

[INFO] ----------------------------------------------------------------------------------------------------------------------------------------------------------------

[INFO] About to build [web]...
[INFO]Build: Updating asset graph...
[INFO]Build: Updating asset graph completed, took 12ms

[INFO]Build: Running build...
[INFO]Build: Running build completed, took 359ms

[INFO]Build: Caching finalized dependency graph...
[INFO]Build: Caching finalized dependency graph completed, took 242ms

[INFO]Build: Succeeded after 652ms with 9 outputs (7 actions)

[INFO] ----------------------------------------------------------------------------------------------------------------------------------------------------------------

```

<!--
     Run `flutter analyze` and attach any output of that command below.
     If there are any analysis errors, try resolving them before filing this issue.
-->

```
flutter analyze
Analyzing flutter_web_rawkeyboardlistener_example...                    
No issues found! (ran in 2.8s)
```

<!-- Finally, paste the output of running `flutter doctor -v` here. -->

```
Jeffs-MacBook-Pro-2:flutter_web_rawkeyboardlistener_example jeff$ flutter doctor -v
[✓] Flutter (Channel stable, v1.5.4-hotfix.2, on Mac OS X 10.14.5 18F132, locale en-US)
    • Flutter version 1.5.4-hotfix.2 at /Users/jeff/Projects/git/flutter
    • Framework revision 7a4c33425d (9 weeks ago), 2019-04-29 11:05:24 -0700
    • Engine revision 52c7a1e849
    • Dart version 2.3.0 (build 2.3.0-dev.0.5 a1668566e5)

 
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at /Users/jeff/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
    • All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 10.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 10.2.1, Build version 10E1001
    • ios-deploy 1.9.4
    • CocoaPods version 1.6.1

[✓] Android Studio (version 3.4)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 35.3.1
    • Dart plugin version 183.6270
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[✓] IntelliJ IDEA Community Edition (version 2018.3.5)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 33.4.2
    • Dart plugin version 183.5912.23

[✓] VS Code (version 1.35.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.2.0

[!] Connected device
    ! No devices available

! Doctor found issues in 1 category.
```