Add timestamps to synthesized events.

content/browser/renderer_host/input/synthetic_gesture_target_android.cc

Index: content/browser/renderer_host/input/synthetic_gesture_target_android.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_target_android.cc b/content/browser/renderer_host/input/synthetic_gesture_target_android.cc
index cf5181ab93c9240e02d4164525b7ff28537fbc95..944081a3606724c7e492786a6ff066314c54f8ba 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_target_android.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_target_android.cc
@@ -37,9 +37,10 @@ void SyntheticGestureTargetAndroid::TouchSetPointer(
 }
 
 void SyntheticGestureTargetAndroid::TouchInject(
-    JNIEnv* env, Action action, int pointer_count) {
+    JNIEnv* env, Action action, int pointer_count, double timestamp_in_s) {

[jdduke (slow), 2014/01/03 18:24:30]

As noted later, let's make this arg |long time_in_ms|.

[Dominik Grewe, 2014/01/06 11:46:07]

Done.

   Java_TouchEventSynthesizer_inject(env, touch_event_synthesizer_.obj(),
-                                  static_cast<int>(action), pointer_count);
+                                    static_cast<int>(action), pointer_count,
+                                    timestamp_in_s);
 }
 
 void SyntheticGestureTargetAndroid::DispatchWebTouchEventToPlatform(
@@ -70,7 +71,7 @@ void SyntheticGestureTargetAndroid::DispatchWebTouchEventToPlatform(
     TouchSetPointer(env, i, point->position.x, point->position.y, point->id);
   }
 
-  TouchInject(env, action, num_touches);
+  TouchInject(env, action, num_touches, web_touch.timeStampSeconds);
 }
 
 SyntheticGestureParams::GestureSourceType