Add a separate call to initialize the bounds for a sky <iframe> element.

sky/engine/public/web/WebFrameClient.h

Index: sky/engine/public/web/WebFrameClient.h
diff --git a/sky/engine/public/web/WebFrameClient.h b/sky/engine/public/web/WebFrameClient.h
index 3409dd25e59fc3ba7c771e7c7f56bff479096787..d030de14b4a6fa5e9e918345f617e995364b0205 100644
--- a/sky/engine/public/web/WebFrameClient.h
+++ b/sky/engine/public/web/WebFrameClient.h
@@ -68,11 +68,13 @@ public:
     // until frameDetached() is called on it.
     // Note: If you override this, you should almost certainly be overriding
     // frameDetached().
-    virtual WebFrame* createChildFrame(WebLocalFrame* parent, const WebString& frameName) { return 0; }
+    virtual uint32_t createChildFrame(const WebURL& url) { return static_cast<uint32_t>(-1); }
 
-    virtual void createChildView(const WebURL& url) { }
+    // Initalize parameters for the given child frame.
+    virtual void initializeChildFrame(uint32_t frame_id, const blink::WebRect& bounds) { }
 
     // This frame has been detached from the view, but has not been closed yet.
+    // TODO(mpcomplete): reuse these.
     virtual void frameDetached(WebFrame*) { }
 
     // This frame has become focused..
@@ -242,9 +244,6 @@ public:
     // process. See http://crbug.com/339659.
     virtual void forwardInputEvent(const WebInputEvent*) { }
 
-    // Send initial drawing parameters to a child frame that is being rendered out of process.
-    virtual void initializeChildFrame(const WebRect& frameRect, float scaleFactor) { }
-
 protected:
     virtual ~WebFrameClient() { }
 };