Add helper class for tests using browser process hit testing

content/browser/renderer_host/render_widget_host_view_aura.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 326 matching lines @@
   // on Windows if the context menu is being displayed in response to a long
   // press gesture. On Windows we should be consistent like other apps and
   // display the menu when the touch is released.
   bool OnShowContextMenu(const ContextMenuParams& params);
 
   // Used in tests to set a mock client for touch selection controller. It will
   // create a new touch selection controller for the new client.
   void SetSelectionControllerClientForTest(
       scoped_ptr<TouchSelectionControllerClientAura> client);
 
+  // Exposed for tests.
+  cc::SurfaceId SurfaceIdForTesting() const override;
+
  protected:
   ~RenderWidgetHostViewAura() override;
 
   // Exposed for tests.
   aura::Window* window() { return window_; }
 
   DelegatedFrameHost* GetDelegatedFrameHost() const {
     return delegated_frame_host_.get();
   }
   const ui::MotionEventAura& pointer_state() const { return pointer_state_; }
@@ skipping 343 matching lines @@
   float device_scale_factor_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAura> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_