Implement window management devtools commands for headless.

headless/lib/browser/headless_browser_impl.h

 // Copyright 2015 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_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_
 
 #include "headless/public/headless_browser.h"
 
 #include <memory>
@@ skipping 54 matching lines @@
   void RunOnStartCallback();
 
   HeadlessBrowser::Options* options() { return &options_; }
 
   HeadlessBrowserContext* CreateBrowserContext(
       HeadlessBrowserContext::Builder* builder);
   // Close given |browser_context| and delete it
   // (all web contents associated with it go away too).
   void DestroyBrowserContext(HeadlessBrowserContextImpl* browser_context);
 
+  HeadlessWebContentsImpl* GetWebContentsForWindowId(const int window_id);
+
   base::WeakPtr<HeadlessBrowserImpl> GetWeakPtr();
 
   // All the methods that begin with Platform need to be implemented by the
   // platform specific headless implementation.
   // Helper for one time initialization of application
   void PlatformInitialize();
   void PlatformCreateWindow();
   void PlatformInitializeWebContents(const gfx::Size& initial_size,
                                      HeadlessWebContentsImpl* web_contents);
 
@@ skipping 10 matching lines @@
 
   base::WeakPtrFactory<HeadlessBrowserImpl> weak_ptr_factory_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HeadlessBrowserImpl);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_