chromeos: Add support for the battery status API on chromeos.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 10aa0119277c2126e0e533d5234da8d88242c1f0..eca34c9e50f95416ba7f66d0978df6173963baaa 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -41,6 +41,7 @@ class WebDatabaseObserverImpl;
 class WebGraphicsContext3DCommandBufferImpl;
 
 namespace WebKit {
+class WebBatteryMonitor;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 }
@@ -206,6 +207,9 @@ class CONTENT_EXPORT RenderThreadImpl : public content::RenderThread,
   // has been lost.
   GpuChannelHost* GetGpuChannel();
 
+  // Gets the embedder implementation of WebBatteryMonitor.
+  WebKit::WebBatteryMonitor* GetBatteryMonitor();
+
   // Returns a MessageLoopProxy instance corresponding to the message loop
   // of the thread on which file operations should be run. Must be called
   // on the renderer's main thread.
@@ -303,6 +307,8 @@ class CONTENT_EXPORT RenderThreadImpl : public content::RenderThread,
 
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> gpu_vda_context3d_;
 
+  scoped_ptr<WebKit::WebBatteryMonitor> battery_monitor_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };