Add embedder api for participating in gpu logic

content/public/app/content_main_delegate.cc

Index: content/public/app/content_main_delegate.cc
diff --git a/content/public/app/content_main_delegate.cc b/content/public/app/content_main_delegate.cc
index 3c979be537e751738930ee2d697422e28a610c87..16fd80440f59c8509002aec8bea0c91abb77fe1d 100644
--- a/content/public/app/content_main_delegate.cc
+++ b/content/public/app/content_main_delegate.cc
@@ -11,6 +11,7 @@
 #endif
 
 #if !defined(OS_IOS)
+#include "content/public/gpu/content_gpu_client.h"
 #include "content/public/plugin/content_plugin_client.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/public/utility/content_utility_client.h"
@@ -64,6 +65,14 @@ ContentBrowserClient* ContentMainDelegate::CreateContentBrowserClient() {
 #endif
 }
 
+ContentGpuClient* ContentMainDelegate::CreateContentGpuClient() {
+#if defined(OS_IOS) || defined(CHROME_MULTIPLE_DLL_BROWSER)
+  return NULL;
+#else
+  return new ContentGpuClient();
+#endif
+}
+
 ContentPluginClient* ContentMainDelegate::CreateContentPluginClient() {
 #if defined(OS_IOS) || defined(CHROME_MULTIPLE_DLL_BROWSER)
   return NULL;