[DevTools] Expose DevToolsAgentHost for OOPIF, display it in chrome://inspect.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 191 matching lines @@
   RenderViewHostImpl* render_view_host() { return render_view_host_; }
   RenderFrameHostDelegate* delegate() { return delegate_; }
   FrameTreeNode* frame_tree_node() { return frame_tree_node_; }
 
   // This returns the RenderFrameHost's owned RenderWidgetHost if it has one,
   // or else it returns nullptr.
   // If the RenderFrameHost is the page's main frame, this returns instead a
   // pointer to the RenderViewHost (which inherits RenderWidgetHost).
   RenderWidgetHostImpl* GetRenderWidgetHost();
 
+  // Returns whether this frame is the root of the frame group. Frame group

[Charlie Reis, 2015/03/05 20:31:14]

This is redundant with IsCrossProcessSubframe, so we should probably just use
that instead.  (IsCrossProcessSubframe returns whether a frame is in a different
process than its parent frame, which is exactly the case that it has its own
widget and is the "root of a new frame group.")

[dgozman, 2015/03/06 16:14:14]

Done.

+  // is the continuous group of frames living in the same process.
+  bool IsFrameGroupRoot() { return GetRenderWidgetHost(); }

[nasko, 2015/03/05 15:20:48]

non-trivial method's implementations need to be in the .cc file. Also,
GetRenderWidgetHost() returns a pointer type, use "!!" to explicitly convert to
boolean.

+
   // This returns the RenderWidgetHostView that can be used to control
   // focus and visibility for this frame.
   RenderWidgetHostView* GetView();
 
   // This function is called when this is a swapped out RenderFrameHost that
   // lives in the same process as the parent frame. The
   // |cross_process_frame_connector| allows the non-swapped-out
   // RenderFrameHost for a frame to communicate with the parent process
   // so that it may composite drawing data.
   //
@@ skipping 482 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_