[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 4f93aadae3e22dd3648884984a13ab1249c4bd9b..0494da6734fd49e52d14fe3b8b63337a207fb960 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 DocumentState;
 class ExternalPopupMenu;
 class GeolocationDispatcher;
@@ -755,6 +756,10 @@ class CONTENT_EXPORT RenderFrameImpl
   // case of the main frame, but not subframes).
   blink::WebLocalFrame* frame_;
 
+  // Frame is a local root if it is rendered in a process different than parent
+  // or it is a main frame.
+  bool is_local_root_;
+
   base::WeakPtr<RenderViewImpl> render_view_;
   int routing_id_;
   bool is_swapped_out_;
@@ -867,6 +872,10 @@ class CONTENT_EXPORT RenderFrameImpl
   bool contains_media_player_;
 #endif
 
+  // The devtools agent for this frame; only created for main frame and
+  // local roots.
+  DevToolsAgent* devtools_agent_;
+
   // The geolocation dispatcher attached to this frame, lazily initialized.
   GeolocationDispatcher* geolocation_dispatcher_;