[DevTools] Move DevToolsAgent to RenderFrameImpl.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index cbe833d947714282085cf70b93a6cbfa66ad0837..c53b27ce77b31e0d9f7dcf4ea1791d1b6a875985 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -74,6 +74,7 @@ namespace content {
 
 class ChildFrameCompositingHelper;
 class CompositorDependencies;
+class DevToolsAgent;
 class ExternalPopupMenu;
 class GeolocationDispatcher;
 class ManifestManager;
@@ -541,6 +542,8 @@ class CONTENT_EXPORT RenderFrameImpl
 
   ManifestManager* manifest_manager();
 
+  void CreateDevToolsAgent();
+
  protected:
   RenderFrameImpl(RenderViewImpl* render_view, int32 routing_id);
 
@@ -569,6 +572,10 @@ class CONTENT_EXPORT RenderFrameImpl
   void AddObserver(RenderFrameObserver* observer);
   void RemoveObserver(RenderFrameObserver* observer);
 
+  // Returns whether this frame is a root of a frame subtree, where all the
+  // frames live in the same process.
+  bool IsLocalRoot();
+
   // Builds and sends DidCommitProvisionalLoad to the host.
   void SendDidCommitProvisionalLoad(blink::WebFrame* frame,
                                     blink::WebHistoryCommitType commit_type);
@@ -846,6 +853,9 @@ class CONTENT_EXPORT RenderFrameImpl
   bool contains_media_player_;
 #endif
 
+  // The devtools agent for this frame; only created for local frame roots.
+  DevToolsAgent* devtools_agent_;
+
   // The geolocation dispatcher attached to this frame, lazily initialized.
   GeolocationDispatcher* geolocation_dispatcher_;