Add Page.stopLoading to devtools and --timeout switch to headless_shell

headless/public/headless_web_contents.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_PUBLIC_HEADLESS_WEB_CONTENTS_H_
 #define HEADLESS_PUBLIC_HEADLESS_WEB_CONTENTS_H_
 
 #include <list>
 #include <string>
 #include <utility>
@@ skipping 53 matching lines @@
   virtual void RemoveObserver(Observer* observer) = 0;
 
   // Return a DevTools target corresponding to this tab. Note that this method
   // won't return a valid value until Observer::DevToolsTargetReady has been
   // signaled.
   virtual HeadlessDevToolsTarget* GetDevToolsTarget() = 0;
 
   // Close this page. |HeadlessWebContents| object will be destroyed.
   virtual void Close() = 0;
 
+  // Cancels any pending navigation.
+  virtual void Stop() = 0;
+
  private:
   friend class HeadlessWebContentsImpl;
   HeadlessWebContents() {}
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessWebContents);
 };
 
 class HEADLESS_EXPORT HeadlessWebContents::Builder {
  public:
   ~Builder();
@@ skipping 62 matching lines @@
   GURL initial_url_ = GURL("about:blank");
   gfx::Size window_size_;
   std::list<MojoService> mojo_services_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_HEADLESS_WEB_CONTENTS_H_