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

content/browser/devtools/render_frame_devtools_agent_host.h

Index: content/browser/devtools/render_frame_devtools_agent_host.h
diff --git a/content/browser/devtools/render_frame_devtools_agent_host.h b/content/browser/devtools/render_frame_devtools_agent_host.h
index 51f12d40b226c4d740484457a2b4e565b68c0b8b..57be8354186ea991236a6a7d1716cc6eab36e2d4 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.h
+++ b/content/browser/devtools/render_frame_devtools_agent_host.h
@@ -48,6 +48,8 @@ class CONTENT_EXPORT RenderFrameDevToolsAgentHost
       private WebContentsObserver,
       public NotificationObserver {
  public:
+  static void AddAllAgentHosts(DevToolsAgentHost::List* result);
+
   static void OnCancelPendingNavigation(RenderFrameHost* pending,
                                         RenderFrameHost* current);
 
@@ -72,6 +74,11 @@ class CONTENT_EXPORT RenderFrameDevToolsAgentHost
   explicit RenderFrameDevToolsAgentHost(RenderFrameHost*);
   ~RenderFrameDevToolsAgentHost() override;
 
+  static scoped_refptr<DevToolsAgentHost> GetOrCreateFor(RenderFrameHost* host);
+  static void AppendAgentHostForFrameIfApplicable(
+      std::vector<scoped_refptr<DevToolsAgentHost>>* result,
+      RenderFrameHost* host);
+
   // IPCDevToolsAgentHost overrides.
   void DispatchProtocolMessage(const std::string& message) override;
   void SendMessageToAgent(IPC::Message* msg) override;
@@ -118,6 +125,8 @@ class CONTENT_EXPORT RenderFrameDevToolsAgentHost
   void InnerOnClientAttached();
   void InnerClientDetachedFromRenderer();
 
+  bool IsChildFrame();
+
   RenderFrameHostImpl* render_frame_host_;
   scoped_ptr<devtools::dom::DOMHandler> dom_handler_;
   scoped_ptr<devtools::input::InputHandler> input_handler_;