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 9a1f0cefc3ed01dcb98076b8c226ac92fc540012..b4c911e1977284a79a644d258b017bc30f85ffe4 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;
@@ -511,6 +512,12 @@ 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() { }
 };