Cross-process iframe accessibility.

content/browser/frame_host/render_frame_proxy_host.h

Index: content/browser/frame_host/render_frame_proxy_host.h
diff --git a/content/browser/frame_host/render_frame_proxy_host.h b/content/browser/frame_host/render_frame_proxy_host.h
index bba289afb1f74c43b4ef9abd7eea63aebbe25661..2a34fc2a6ee0ac2834198d28e5b0966f8eec0fea 100644
--- a/content/browser/frame_host/render_frame_proxy_host.h
+++ b/content/browser/frame_host/render_frame_proxy_host.h
@@ -55,6 +55,8 @@ class RenderFrameProxyHost
     : public IPC::Listener,
       public IPC::Sender {
  public:
+  static RenderFrameProxyHost* FromID(int process_id, int routing_id);
+
   RenderFrameProxyHost(SiteInstance* site_instance,
                        FrameTreeNode* frame_tree_node);
   virtual ~RenderFrameProxyHost();
@@ -75,6 +77,8 @@ class RenderFrameProxyHost
     return site_instance_.get();
   }
 
+  FrameTreeNode* frame_tree_node() const { return frame_tree_node_; };
+
   void SetChildRWHView(RenderWidgetHostView* view);
 
   // TODO(nasko): The following methods should be removed once we don't have a