Set the unique_event_id when converting from TouchEvent to WebTouchEvent

content/browser/renderer_host/input/motion_event_android.cc

Index: content/browser/renderer_host/input/motion_event_android.cc
diff --git a/content/browser/renderer_host/input/motion_event_android.cc b/content/browser/renderer_host/input/motion_event_android.cc
index 3f18f95561b3d650ccc3b3d36bd040f6f12f587f..e94071a20ad104a3971eb7c668816560e940c7c8 100644
--- a/content/browser/renderer_host/input/motion_event_android.cc
+++ b/content/browser/renderer_host/input/motion_event_android.cc
@@ -9,6 +9,7 @@
 #include "base/android/jni_android.h"
 #include "base/float_util.h"
 #include "jni/MotionEvent_jni.h"
+#include "ui/events/base_event_utils.h"
 #include "ui/events/event_constants.h"
 
 using base::android::AttachCurrentThread;
@@ -164,7 +165,8 @@ MotionEventAndroid::MotionEventAndroid(float pix_to_dip,
       cached_button_state_(FromAndroidButtonState(android_button_state)),
       cached_flags_(FromAndroidMetaState(meta_state)),
       cached_raw_position_offset_(ToDips(raw_offset_x_pixels),
-                                  ToDips(raw_offset_y_pixels)) {
+                                  ToDips(raw_offset_y_pixels)),
+      unique_event_id_(ui::GetNextTouchEventId()) {
   DCHECK_GT(pointer_count, 0);
 
   event_.Reset(env, event);
@@ -182,6 +184,10 @@ int MotionEventAndroid::GetId() const {
   return 0;
 }
 
+uint64 MotionEventAndroid::GetUniqueEventId() const {
+  return unique_event_id_;
+}
+
 MotionEventAndroid::Action MotionEventAndroid::GetAction() const {
   return cached_action_;
 }