Add embedder api for participating in gpu logic

content/public/common/content_client.cc

Index: content/public/common/content_client.cc
diff --git a/content/public/common/content_client.cc b/content/public/common/content_client.cc
index e7f50c8df98375864e06dda79d52b8cd9943c2f7..75ed9979f0770168c5de239cb2944b9d51be9668 100644
--- a/content/public/common/content_client.cc
+++ b/content/public/common/content_client.cc
@@ -62,8 +62,11 @@ ContentUtilityClient* SetUtilityClientForTesting(ContentUtilityClient* u) {
 }
 
 ContentClient::ContentClient()
-    : browser_(NULL), plugin_(NULL), renderer_(NULL), utility_(NULL) {
-}
+    : browser_(NULL),
+      gpu_(NULL),
+      plugin_(NULL),
+      renderer_(NULL),
+      utility_(NULL) {}
 
 ContentClient::~ContentClient() {
 }