Move WebScreenOrientationClient to WebFrameClient.

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index 3d5a5ec4b035e91491a7a8560b27f02d5ca7e4f6..ca0f8c2a7e6b5fc98e4f7943299a25765428d7d8 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -75,6 +75,7 @@ class WebSocketHandle;
 class WebNode;
 class WebPlugin;
 class WebRTCPeerConnectionHandler;
+class WebScreenOrientationClient;
 class WebSharedWorker;
 class WebSharedWorkerClient;
 class WebSocketStreamHandle;
@@ -508,6 +509,12 @@ public:
     // Send initial drawing parameters to a child frame that is being rendered out of process.
     virtual void initializeChildFrame(const WebRect& frameRect, float scaleFactor) { }
 
+
+    // Screen Orientation --------------------------------------------------
+
+    // Access the embedder API for (client-based) screen orientation client .
+    virtual WebScreenOrientationClient* webScreenOrientationClient() { return 0; }
+
 protected:
     virtual ~WebFrameClient() { }
 };