Changed DeviceDataManager to be able to create multiple instances for the purposes of test.

ui/events/devices/device_data_manager.h

 // 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.
 
 #ifndef UI_EVENTS_DEVICES_DEVICE_DATA_MANAGER_H_
 #define UI_EVENTS_DEVICES_DEVICE_DATA_MANAGER_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 12 matching lines @@
 class InputDeviceEventObserver;
 
 // Keeps track of device mappings and event transformations.
 class EVENTS_DEVICES_EXPORT DeviceDataManager
     : public DeviceHotplugEventObserver {
  public:
   static const int kMaxDeviceNum = 128;
   ~DeviceDataManager() override;
 
   static void CreateInstance();
+  static void DeleteInstance();
   static DeviceDataManager* GetInstance();
   static bool HasInstance();
 
   void ClearTouchDeviceAssociations();
   void UpdateTouchInfoForDisplay(int64_t target_display_id,
                                  int touch_device_id,
                                  const gfx::Transform& touch_transformer);
   void ApplyTouchTransformer(int touch_device_id, float* x, float* y);
 
   // Gets the display that touches from |touch_device_id| should be sent to.
@@ skipping 13 matching lines @@
   bool device_lists_complete() const { return device_lists_complete_; }
 
   void AddObserver(InputDeviceEventObserver* observer);
   void RemoveObserver(InputDeviceEventObserver* observer);
 
  protected:
   DeviceDataManager();
 
   static DeviceDataManager* instance();
 
+  static void set_instance(DeviceDataManager* instance);
+
   // DeviceHotplugEventObserver:
   void OnTouchscreenDevicesUpdated(
       const std::vector<TouchscreenDevice>& devices) override;
   void OnKeyboardDevicesUpdated(
       const std::vector<KeyboardDevice>& devices) override;
   void OnMouseDevicesUpdated(
       const std::vector<InputDevice>& devices) override;
   void OnTouchpadDevicesUpdated(
       const std::vector<InputDevice>& devices) override;
   void OnDeviceListsComplete() override;
@@ skipping 17 matching lines @@
   bool device_lists_complete_ = false;
 
   base::ObserverList<InputDeviceEventObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceDataManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_DEVICES_DEVICE_DATA_MANAGER_H_