[Android] Add AppMenu touch duration metric.

chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuDragHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuDragHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuDragHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuDragHelper.java
index 6f79b8551ae6bad6a4c0fb132808b7952f2c0738..e986737af9d2858c3b6e746629c7a5ef6a25797d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuDragHelper.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuDragHelper.java
@@ -17,6 +17,7 @@ import android.widget.LinearLayout;
 import android.widget.ListPopupWindow;
 import android.widget.ListView;
 
+import org.chromium.base.JNINamespace;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.UmaBridge;
 
@@ -29,6 +30,7 @@ import java.util.ArrayList;
  * hidden in API 16.
  */
 @SuppressLint("NewApi")
+@JNINamespace("appmenu::android")
 class AppMenuDragHelper {
     private final Activity mActivity;
     private final AppMenu mAppMenu;
@@ -146,6 +148,7 @@ class AppMenuDragHelper {
         final int roundedRawX = Math.round(rawX);
         final int roundedRawY = Math.round(rawY);
         final int eventActionMasked = event.getActionMasked();
+        final long timeSinceDown = event.getEventTime() - event.getDownTime();
         final ListView listView = mAppMenu.getPopup().getListView();
 
         mLastTouchX = rawX;
@@ -154,9 +157,11 @@ class AppMenuDragHelper {
         if (eventActionMasked == MotionEvent.ACTION_CANCEL) {
             mAppMenu.dismiss();
             return true;
+        } else if (eventActionMasked == MotionEvent.ACTION_UP) {
+            nativeRecordTouchDuration(timeSinceDown);

[Ted C, 2014/12/10 17:28:55]

this can't be triggered before native is loaded right?  I think we prevent the
menu in all those cases.

[Kibeom Kim (inactive), 2014/12/15 22:14:30]

I tried commeting out ChromeBrowserInitializer#handlePostNativeStartup's task
posting, then menu button didn't work. So yeah you're right.

         }
 
-        mIsSingleTapCanceled |= event.getEventTime() - event.getDownTime() > mTapTimeout;
+        mIsSingleTapCanceled |= timeSinceDown > mTapTimeout;
         mIsSingleTapCanceled |= !pointInView(button, event.getX(), event.getY(), mScaledTouchSlop);
         if (!mIsSingleTapCanceled && eventActionMasked == MotionEvent.ACTION_UP) {
             UmaBridge.usingMenu(false, false);
@@ -277,4 +282,6 @@ class AppMenuDragHelper {
         mScreenVisibleRect.offset(mScreenVisiblePoint[0], mScreenVisiblePoint[1]);
         return mScreenVisibleRect;
     }
+
+    private static native void nativeRecordTouchDuration(long timeMs);
 }