Set the unique_event_id when converting from TouchEvent to WebTouchEvent

content/common/input/web_input_event_traits.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/input/web_input_event_traits.h"
 
 #include <bitset>
 #include <limits>
 
 #include "base/logging.h"
@@ skipping 90 matching lines @@
   point.position.x,
   point.position.y,
   point.radiusX,
   point.radiusY,
   point.rotationAngle,
   point.force);
 }
 
 void ApppendEventDetails(const WebTouchEvent& event, std::string* result) {
   StringAppendF(result,
-                "{\n Touches: %u, Cancelable: %d, CausesScrolling: %d\n[\n",
+                "{\n Touches: %u, Cancelable: %d, CausesScrolling: %d,"
+                " uniqueTouchEventId: %u\n[\n",
                 event.touchesLength,
                 event.cancelable,
-                event.causesScrollingIfUncanceled);
+                event.causesScrollingIfUncanceled,
+                static_cast<uint32_t>(event.uniqueTouchEventId));

[jdduke (slow), 2015/04/17 20:30:01]

I think we have some 64-bit printf-style helpers for formatting, but I don't
seem to recall where they are.

[lanwei, 2015/04/20 19:58:59]

I found "PRIu64", is this the one you have seen before?

   for (unsigned i = 0; i < event.touchesLength; ++i)
     ApppendTouchPointDetails(event.touches[i], result);
   result->append(" ]\n}");
 }
 
 bool CanCoalesce(const WebKeyboardEvent& event_to_coalesce,
                  const WebKeyboardEvent& event) {
   return false;
 }
 
@@ skipping 356 matching lines @@
     case WebInputEvent::TouchStart:
     case WebInputEvent::TouchMove:
     case WebInputEvent::TouchEnd:
       return !static_cast<const WebTouchEvent&>(event).cancelable;
     default:
       return false;
   }
 }
 
 }  // namespace content