Implement GpuArcVideoService for arc video accelerator

chrome/browser/chromeos/chrome_browser_main_chromeos.h

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.h
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.h b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
index 01bcb69f87956b4e588c99a57623d2118862da6b..a4f8b257e9da71f75722efe28734c420b62bf00d 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -19,6 +19,10 @@ namespace arc {
 class ArcServiceManager;
 }
 
+namespace content {
+class GpuArcVideoServiceHost;
+}
+
 namespace chromeos {
 
 class DataPromoNotification;
@@ -82,6 +86,7 @@ class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
   scoped_refptr<chromeos::ExternalMetrics> external_metrics_;
 
   scoped_ptr<arc::ArcServiceManager> arc_service_manager_;
+  scoped_ptr<content::GpuArcVideoServiceHost> gpu_arc_video_service_host_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };