Enable WebViewAccessiblityTest for OOPIF webview.

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 77a62aac7bae4ac9e79fcfaa7e1c1e4136335836..c7704526fbba7d979276e52aeeb32eb6b4913468 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -224,6 +224,10 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // possibly changing focus in distinct but related inner/outer WebContents.
   virtual void SetFocusedFrame(FrameTreeNode* node, SiteInstance* source) {}
 
+  // Gets the focused frame from possibly another inner WebContents that

[dmazzoni, 2017/02/16 00:19:02]

The comment says "focused" but the name of the function and
the implementation don't really have anything to do with
"focused" as far as I can tell...

After reading through the impl in WebContents I'm still not
really clear what this does conceptually. Can you come up with
a more clear name for this? I'd prefer a longer more verbose
name over a short one since it's pretty obscure and only used
in one place.

[avallee, 2017/02/21 20:00:31]

Done. Got a longer, more descriptive, name. Also, expanded the comment.

+  // is currently focused.
+  virtual RenderFrameHost* GetFrameAtNode(FrameTreeNode* tree_node);
+
   // Creates a WebUI object for a frame navigating to |url|. If no WebUI
   // applies, returns null.
   virtual std::unique_ptr<WebUIImpl> CreateWebUIForRenderFrameHost(