Refcount touch tracking ids to prevent freeing them too early.

ui/events/events_stub.cc

 // Copyright (c) 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 "base/logging.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/vector2d.h"
 
 namespace ui {
 
 // Stub implementations of platform-specific methods in events_util.h, built
-// on platform sthat currently do not have a complete implementation of events.
+// on platforms that currently do not have a complete implementation of events.
 
 void UpdateDeviceList() {
   NOTIMPLEMENTED();
 }
 
 EventType EventTypeFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return ET_UNKNOWN;
 }
 
@@ skipping 36 matching lines @@
 
 base::NativeEvent CopyNativeEvent(const base::NativeEvent& event) {
   NOTIMPLEMENTED() <<
       "Don't know how to copy base::NativeEvent for this platform";
   return NULL;
 }
 
 void ReleaseCopiedNativeEvent(const base::NativeEvent& event) {
 }
 
+void IncrementTouchIdRefCount(const base::NativeEvent& native_event) {
+  NOTIMPLEMENTED();
+}
+
 void ClearTouchIdIfReleased(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
 }
 
 int GetTouchId(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
 
 float GetTouchRadiusX(const base::NativeEvent& native_event) {
@@ skipping 52 matching lines @@
   NOTIMPLEMENTED();
   return "";
 }
 
 uint32 PlatformKeycodeFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
 
 }  // namespace ui