Add repeatCount to RawKeyEventDataAndroid (#42861)

* Add repeatCount to RawKeyEventDataAndroid

Adds a new field to RawKeyEventDataAndroid and sets it to the value
passed from the engine. It is the value returned by
KeyEvent.getRepeatCount(). This allows us to differentiate between
events generated by a new keypress and repeated events when a key is
held down.

* Add test for RawKeyEventDataAndroid.repeatCount

dev/manual_tests/lib/raw_keyboard.dart

@@ -102,6 +102,7 @@ class _HardwareKeyDemoState extends State<RawKeyboardDemo> {
             dataText.add(Text('vendorId: ${data.vendorId} (${_asHex(data.vendorId)})'));
             dataText.add(Text('productId: ${data.productId} (${_asHex(data.productId)})'));
             dataText.add(Text('flags: ${data.flags} (${_asHex(data.flags)})'));
+            dataText.add(Text('repeatCount: ${data.repeatCount} (${_asHex(data.repeatCount)})'));
           } else if (data is RawKeyEventDataFuchsia) {
             dataText.add(Text('codePoint: ${data.codePoint} (${_asHex(data.codePoint)})'));
             dataText.add(Text('hidUsage: ${data.hidUsage} (${_asHex(data.hidUsage)})'));

packages/flutter/lib/src/services/raw_keyboard.dart

@@ -261,6 +261,7 @@ abstract class RawKeyEvent extends Diagnosticable {
           vendorId: message['vendorId'] ?? 0,
           productId: message['productId'] ?? 0,
           deviceId: message['deviceId'] ?? 0,
+          repeatCount: message['repeatCount'] ?? 0,
         );
         break;
       case 'fuchsia':

packages/flutter/lib/src/services/raw_keyboard_android.dart

@@ -37,6 +37,7 @@ class RawKeyEventDataAndroid extends RawKeyEventData {
     this.vendorId = 0,
     this.productId = 0,
     this.deviceId = 0,
+    this.repeatCount = 0,
   }) : assert(flags != null),
        assert(codePoint != null),
        assert(keyCode != null),
@@ -128,12 +129,17 @@ class RawKeyEventDataAndroid extends RawKeyEventData {
   /// for the numerical values of the `productId`.
   final int productId;
 
-
   /// The ID of the device that produced the event.
   ///
   /// See https://developer.android.com/reference/android/view/InputDevice.html#getId()
   final int deviceId;
 
+  /// The repeat count of the event.
+  ///
+  /// See <https://developer.android.com/reference/android/view/KeyEvent#getRepeatCount()>
+  /// for more information.
+  final int repeatCount;
+
   // The source code that indicates that an event came from a joystick.
   // from https://developer.android.com/reference/android/view/InputDevice.html#SOURCE_JOYSTICK
   static const int _sourceJoystick = 0x01000010;

packages/flutter/test/services/raw_keyboard_test.dart

@@ -225,6 +225,22 @@ void main() {
       final RawKeyEventDataAndroid data = joystickDpadCenter.data;
       expect(data.deviceId, equals(10));
     });
+    test('Repeat count is passed correctly', () {
+      final RawKeyEvent repeatCountEvent = RawKeyEvent.fromMessage(<String, dynamic>{
+        'type': 'keydown',
+        'keymap': 'android',
+        'keyCode': 29,
+        'plainCodePoint': 'a'.codeUnitAt(0),
+        'codePoint': 'A'.codeUnitAt(0),
+        'character': 'A',
+        'scanCode': 30,
+        'metaState': 0x0,
+        'source': 0x101, // Keyboard source.
+        'repeatCount': 42,
+      });
+      final RawKeyEventDataAndroid data = repeatCountEvent.data;
+      expect(data.repeatCount, equals(42));
+    });
   });
   group('RawKeyEventDataFuchsia', () {
     const Map<int, _ModifierCheck> modifierTests = <int, _ModifierCheck>{