Pipe the devTools FrameId from blink into the browser for headless

headless/public/headless_browser_context.h

 // Copyright 2016 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 HEADLESS_PUBLIC_HEADLESS_BROWSER_CONTEXT_H_
 #define HEADLESS_PUBLIC_HEADLESS_BROWSER_CONTEXT_H_
 
 #include <list>
 #include <memory>
 #include <string>
@@ skipping 41 matching lines @@
   // c) Calling HeadlessBrowser::Shutdown.
   virtual HeadlessWebContents::Builder CreateWebContentsBuilder() = 0;
 
   // Returns all web contents owned by this browser context.
   virtual std::vector<HeadlessWebContents*> GetAllWebContents() = 0;
 
   // See HeadlessBrowser::GetWebContentsForDevToolsAgentHostId.
   virtual HeadlessWebContents* GetWebContentsForDevToolsAgentHostId(
       const std::string& devtools_agent_host_id) = 0;
 
+  // Returns the frame tree node id for the corresponding RenderFrameHost or -1
+  // if it can't be found. Can be called on any thread.
+  virtual int GetFrameTreeNodeId(int render_process_id,
+                                 int render_frame_id) const = 0;
+
   // Destroy this BrowserContext and all WebContents associated with it.
   virtual void Close() = 0;
 
   // GUID for this browser context.
   virtual const std::string& Id() const = 0;
 
   // TODO(skyostil): Allow saving and restoring contexts (crbug.com/617931).
 
  protected:
   HeadlessBrowserContext() {}
@@ skipping 73 matching lines @@
 
   std::list<MojoBindings> mojo_bindings_;
   bool enable_http_and_https_if_mojo_used_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_HEADLESS_BROWSER_CONTEXT_H_