Use Event to render feedback animations.

remoting/android/java/src/org/chromium/chromoting/TapGestureDetector.java

Index: remoting/android/java/src/org/chromium/chromoting/TapGestureDetector.java
diff --git a/remoting/android/java/src/org/chromium/chromoting/TapGestureDetector.java b/remoting/android/java/src/org/chromium/chromoting/TapGestureDetector.java
index 45dab790a2c3012a486115f42e55466289824cec..a599fd6b12871f474798c52290a791e8e48da8c9 100644
--- a/remoting/android/java/src/org/chromium/chromoting/TapGestureDetector.java
+++ b/remoting/android/java/src/org/chromium/chromoting/TapGestureDetector.java
@@ -42,10 +42,10 @@ public class TapGestureDetector {
     }
 
     /** The listener to which notifications are sent. */
-    private OnTapListener mListener;
+    private final OnTapListener mListener;
 
     /** Handler used for posting tasks to be executed in the future. */
-    private Handler mHandler;
+    private final Handler mHandler;
 
     /** The maximum number of fingers seen in the gesture. */
     private int mPointerCount = 0;
@@ -81,9 +81,10 @@ public class TapGestureDetector {
         public void handleMessage(Message message) {
             TapGestureDetector detector = mDetector.get();
             if (detector != null) {
+                detector.mTapCancelled = true;
                 detector.mListener.onLongPress(
                         detector.mPointerCount, detector.mInitialPoint.x, detector.mInitialPoint.y);
-                detector.mTapCancelled = true;
+                detector.mInitialPoint = null;
             }
         }
     }
@@ -102,9 +103,9 @@ public class TapGestureDetector {
         switch (event.getActionMasked()) {
             case MotionEvent.ACTION_DOWN:
                 reset();
+                trackDownEvent(event);
                 // Cause a long-press notification to be triggered after the timeout.

[Lambros, 2016/06/01 23:51:37]

Blank line before comment.

[Hzj_jie, 2016/06/02 02:21:37]

Done.

                 mHandler.sendEmptyMessageDelayed(0, ViewConfiguration.getLongPressTimeout());
-                trackDownEvent(event);
                 mPointerCount = 1;
                 break;