Android Platform Views support Verified Input Events

Android Platform Views process MotionEvents in a complicated way:

1. MotionEvent is processed by the `AndroidTouchProcessor` and transmitted
to the engine for delivery to the framework.
2. Framework processes the MotionEvent as a PointerEvent.
3. Eventually the PointerEvent is transmitted back to Android and a new
MotionEvent is synthesized.
4. The MotionEvent is delivered to the platform view.

After step (3) the MotionEvent will fail Verification
(`android.hardware.input.InputManager.verifyInputEvent`).

The fix requires that in step (3) we use the original motion event delivered
in step (1) instead of synthesizing a new instance.

shell/platform/android/io/flutter/embedding/android/AndroidTouchProcessor.java

@@ -19,7 +19,7 @@
 
 /** Sends touch information from Android to Flutter in a format that Flutter understands. */
 public class AndroidTouchProcessor {
-
+  private static final String TAG = "AndroidTouchProcessor";
   // Must match the PointerChange enum in pointer.dart.
   @IntDef({
     PointerChange.CANCEL,

shell/platform/android/io/flutter/embedding/android/MotionEventTracker.java

@@ -9,7 +9,7 @@
 
 /** Tracks the motion events received by the FlutterView. */
 public final class MotionEventTracker {
-
+  private static final String TAG = "MotionEventTracker";
   /** Represents a unique identifier corresponding to a motion event. */
   public static class MotionEventId {
     private static final AtomicLong ID_COUNTER = new AtomicLong(0);

shell/platform/android/io/flutter/plugin/platform/PlatformViewsController.java

@@ -677,6 +677,10 @@ public MotionEvent toMotionEvent(
         MotionEventTracker.MotionEventId.from(touch.motionEventId);
     MotionEvent trackedEvent = motionEventTracker.pop(motionEventId);
 
+    if (!usingVirtualDiplay && trackedEvent != null) {
+      return trackedEvent;
+    }
+
     // Pointer coordinates in the tracked events are global to FlutterView
     // framework converts them to be local to a widget, given that
     // motion events operate on local coords, we need to replace these in the tracked
@@ -688,24 +692,6 @@ public MotionEvent toMotionEvent(
         parsePointerCoordsList(touch.rawPointerCoords, density)
             .toArray(new PointerCoords[touch.pointerCount]);
 
-    if (!usingVirtualDiplay && trackedEvent != null) {
-      return MotionEvent.obtain(
-          trackedEvent.getDownTime(),
-          trackedEvent.getEventTime(),
-          trackedEvent.getAction(),
-          trackedEvent.getPointerCount(),
-          pointerProperties,
-          pointerCoords,
-          trackedEvent.getMetaState(),
-          trackedEvent.getButtonState(),
-          trackedEvent.getXPrecision(),
-          trackedEvent.getYPrecision(),
-          trackedEvent.getDeviceId(),
-          trackedEvent.getEdgeFlags(),
-          trackedEvent.getSource(),
-          trackedEvent.getFlags());
-    }
-
     // TODO (kaushikiska) : warn that we are potentially using an untracked
     // event in the platform views.
     return MotionEvent.obtain(