Gamepad API: add support for connection events

content/renderer/render_thread_impl.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_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 15 matching lines @@
 #include "third_party/WebKit/public/web/mac/WebScrollbarTheme.h"
 #endif
 
 class GrContext;
 class SkBitmap;
 struct ViewMsg_New_Params;
 struct WorkerProcessMsg_CreateWorker_Params;
 
 namespace blink {
 class WebGamepads;
+class WebGamepadListener;
 class WebGraphicsContext3D;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 }
 
 namespace base {
 class MessageLoopProxy;
 class Thread;
 }
 
@@ skipping 313 matching lines @@
   HistogramCustomizer* histogram_customizer() {
     return &histogram_customizer_;
   }
 
   void SetFlingCurveParameters(const std::vector<float>& new_touchpad,
                                const std::vector<float>& new_touchscreen);
 
   // Retrieve current gamepad data.
   void SampleGamepads(blink::WebGamepads* data);
 
+  // Set a listener for gamepad connected/disconnected events.
+  // A non-null listener must be set first before calling SampleGamepads.
+  void SetGamepadListener(blink::WebGamepadListener* listener);

[jam, 2014/05/05 17:20:32]

nit: how about we remove this method, and instead expose a getter for
gamepad_shared_memory_reader_? RenderThreadImpl shouldn't have to know about
every feature, other than being a central place that owns process-wide objects
in the renderer

+
   // Called by a RenderWidget when it is created or destroyed. This
   // allows the process to know when there are no visible widgets.
   void WidgetCreated();
   void WidgetDestroyed();
   void WidgetHidden();
   void WidgetRestored();
 
   void AddSharedWorkerRoute(int32 routing_id, IPC::Listener* listener);
   void RemoveSharedWorkerRoute(int32 routing_id);
 
@@ skipping 144 matching lines @@
 
   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
   scoped_ptr<media::AudioHardwareConfig> audio_hardware_config_;
 
   HistogramCustomizer histogram_customizer_;
 
   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 
-  scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
+  scoped_refptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 
   // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
   // multiple threads. Current allocation mechanism for IOSurface
   // backed GpuMemoryBuffers prevent this. crbug.com/325045
   base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
 
   // Compositor settings
   bool is_gpu_rasterization_enabled_;
   bool is_gpu_rasterization_forced_;
   bool is_impl_side_painting_enabled_;
   bool is_low_res_tiling_enabled_;
   bool is_lcd_text_enabled_;
   bool is_map_image_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_