Set the unique_event_id when converting from TouchEvent to WebTouchEvent

content/browser/renderer_host/input/motion_event_web.cc

Index: content/browser/renderer_host/input/motion_event_web.cc
diff --git a/content/browser/renderer_host/input/motion_event_web.cc b/content/browser/renderer_host/input/motion_event_web.cc
index 2d276f0371ea23757ad508f23df1cdb496d015ed..ece1146e69f2c870843001b19715a15ab6b7eb70 100644
--- a/content/browser/renderer_host/input/motion_event_web.cc
+++ b/content/browser/renderer_host/input/motion_event_web.cc
@@ -12,6 +12,7 @@
 #include "base/logging.h"
 #include "content/browser/renderer_host/input/web_input_event_util.h"
 #include "content/common/input/web_touch_event_traits.h"
+#include "ui/events/base_event_utils.h"
 
 using blink::WebInputEvent;
 using blink::WebTouchEvent;
@@ -63,7 +64,8 @@ int GetActionIndexFrom(const WebTouchEvent& event) {
 MotionEventWeb::MotionEventWeb(const WebTouchEvent& event)
     : event_(event),
       cached_action_(GetActionFrom(event)),
-      cached_action_index_(GetActionIndexFrom(event)) {
+      cached_action_index_(GetActionIndexFrom(event)),
+      unique_event_id_(ui::GetNextTouchEventId()) {
   DCHECK_GT(GetPointerCount(), 0U);
 }
 
@@ -73,6 +75,10 @@ int MotionEventWeb::GetId() const {
   return 0;
 }
 
+uint64 MotionEventWeb::GetUniqueEventId() const {
+  return unique_event_id_;

[tdresser, 2015/04/09 12:33:06]

Did you figure out why there were no test failures when you returned 0 here
before?

[lanwei, 2015/04/16 17:09:06]

The unit test does not use this type, it uses WebTouchEvent directly.

+}
+
 MotionEventWeb::Action MotionEventWeb::GetAction() const {
   return cached_action_;
 }