Create a new RenderFrameHost per child frame when --site-per-process is enabled.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 997452aeb5447c915c3e7eed57d401492a39223c..e817e2584cdbaa187285f548cb5187fc8340a382 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -46,6 +46,7 @@ class Size;
 namespace content {
 
 class BrowserContext;
+class FrameTree;
 class PageState;
 class RenderViewHost;
 class RenderViewHostDelegateView;
@@ -431,6 +432,13 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   virtual SessionStorageNamespace* GetSessionStorageNamespace(
       SiteInstance* instance);
 
+  // Returns the FrameTree the render view should use. Guaranteed to be constant
+  // for the lifeitme of the render view.

[Charlie Reis, 2013/09/24 18:25:58]

nit: lifetime

[awong, 2013/09/26 21:25:24]

Done.

+  //
+  // TODO(ajwong): Remove once the main frame RenderFrameHost is no longer
+  // created by the RenderViewHost.
+  virtual FrameTree* GetFrameTree();
+
  protected:
   virtual ~RenderViewHostDelegate() {}
 };