Land http://codereview.chromium.org/159067:

chrome/browser/renderer_host/render_view_host_delegate.h

Index: chrome/browser/renderer_host/render_view_host_delegate.h
diff --git a/chrome/browser/renderer_host/render_view_host_delegate.h b/chrome/browser/renderer_host/render_view_host_delegate.h
index 564a6e802fa32d6ad72ff918c2da34b8fb34276a..d9a7d9c3fff69b8b9d1083d8a40bbc229aa462ab 100644
--- a/chrome/browser/renderer_host/render_view_host_delegate.h
+++ b/chrome/browser/renderer_host/render_view_host_delegate.h
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/string16.h"
+#include "chrome/common/view_types.h"
 #include "net/base/load_states.h"
 #include "webkit/glue/window_open_disposition.h"
 
@@ -373,6 +374,13 @@ class RenderViewHostDelegate {
   // not a TabContents, returns NULL.
   virtual TabContents* GetAsTabContents();
 
+  // Return id number of browser window which this object is attached to. If no
+  // browser window is attached to, just return -1.
+  virtual int GetBrowserWindowID() const = 0;
+
+  // Return type of RenderView which is attached with this object.
+  virtual ViewType::Type GetRenderViewType() const = 0;
+
   // The RenderView is being constructed (message sent to the renderer process
   // to construct a RenderView).  Now is a good time to send other setup events
   // to the RenderView.  This precedes any other commands to the RenderView.