Ensure that before creating proxy of site A, RVH of site A is initialized.

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 ed3235ca98bf39c70a5ebb4571efd99e42452b8a..2148b5bddf9ab72d1b6a4c263cd4be69eb4e93fd 100644
--- a/content/browser/frame_host/render_frame_proxy_host.h
+++ b/content/browser/frame_host/render_frame_proxy_host.h
@@ -106,6 +106,13 @@ class RenderFrameProxyHost
   // action in another renderer process.
   void DisownOpener();
 
+  void set_render_frame_proxy_created(bool created) {
+    render_frame_proxy_created_ = created;
+  }
+
+  // Returns if the renderer/ side counterpart for this proxy is alive.
+  bool is_render_frame_proxy_live() { return render_frame_proxy_created_; }
+
  private:
   // IPC Message handlers.
   void OnOpenURL(const FrameHostMsg_OpenURL_Params& params);
@@ -119,6 +126,9 @@ class RenderFrameProxyHost
   // The node in the frame tree where this proxy is located.
   FrameTreeNode* frame_tree_node_;
 
+  // True if we have a live RenderFrameProxy for this host.
+  bool render_frame_proxy_created_;
+
   // When a RenderFrameHost is in a different process from its parent in the
   // frame tree, this class connects its associated RenderWidgetHostView
   // to this RenderFrameProxyHost, which corresponds to the same frame in the