Refactor postMessage for out-of-process iframes.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index 56b563474e07c071f2f250fbf98e4b150b82258f..83233ea2d0183317035323b89d0a98e598fb07f0 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -11,6 +11,7 @@
 #include "base/i18n/rtl.h"
 #include "content/common/content_export.h"
 #include "content/common/frame_message_enums.h"
+#include "content/public/browser/site_instance.h"
 #include "content/public/common/javascript_message_type.h"
 #include "content/public/common/media_stream_request.h"
 #include "net/http/http_response_headers.h"
@@ -168,6 +169,25 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // Notification that the frame wants to go out of fullscreen mode.
   virtual void ExitFullscreenMode() {}
 
+  // Let the delegate decide whether postMessage should be delivered to
+  // |target_rfh| from a source frame in the given SiteInstance.

[Charlie Reis, 2015/04/07 21:14:32]

Let's mention that this overrides the RFH's decision if true, and that it
defaults to false.

[alexmos, 2015/04/07 21:47:30]

Done.

+  virtual bool ShouldRouteMessageEvent(
+      RenderFrameHost* target_rfh,
+      SiteInstance* source_site_instance) const;
+
+  // Ensure that |render_frame_host| has swapped-out RenderViews and proxies

[Charlie Reis, 2015/04/07 21:14:32]

nit: source_rfh

[alexmos, 2015/04/07 21:47:30]

Done.

+  // for itself and for each frame on its opener chain in the current frame's
+  // SiteInstance.  Returns the routing ID of the swapped-out RenderView
+  // corresponding to |render_frame_host|.
+  //
+  // TODO(alexmos): This method will be removed once opener tracking and
+  // CreateOpenerRenderViews moves out of WebContents and into lower layers, as
+  // part of https://crbug.com/225940.  Currently, this method temporarily
+  // supports cross-process postMessage in non-site-per-process mode, where we
+  // need to create any missing proxies for the message's source frame and its
+  // opener chain on demand.
+  virtual int EnsureOpenerRenderViewsExist(RenderFrameHost* render_frame_host);
+
 #if defined(OS_WIN)
   // Returns the frame's parent's NativeViewAccessible.
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();