Block internal PlatformEvents before they are dispatched in touchview.

ui/events/device_data_manager.cc

 // Copyright 2014 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 "ui/events/device_data_manager.h"
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "ui/gfx/display.h"
@@ skipping 30 matching lines @@
 
   new DeviceDataManager();
 }
 
 // static
 DeviceDataManager* DeviceDataManager::GetInstance() {
   CHECK(instance_) << "DeviceDataManager was not created.";
   return instance_;
 }
 
+// static
+bool DeviceDataManager::HasInstance() {
+  return instance_ != NULL;
+}
+
 void DeviceDataManager::ClearTouchTransformerRecord() {
   for (int i = 0; i < kMaxDeviceNum; i++) {
     touch_device_transformer_map_[i] = gfx::Transform();
     touch_device_to_display_map_[i] = gfx::Display::kInvalidDisplayID;
   }
 }
 
 bool DeviceDataManager::IsTouchDeviceIdValid(int touch_device_id) const {
   return (touch_device_id > 0 && touch_device_id < kMaxDeviceNum);
 }
@@ skipping 21 matching lines @@
   }
 }
 
 int64_t DeviceDataManager::GetDisplayForTouchDevice(int touch_device_id) const {
   if (IsTouchDeviceIdValid(touch_device_id))
     return touch_device_to_display_map_[touch_device_id];
   return gfx::Display::kInvalidDisplayID;
 }
 
 }  // namespace ui