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

third_party/WebKit/Source/core/inspector/InspectorPageAgent.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 94 matching lines @@
   // Page API for frontend
   Response enable() override;
   Response disable() override;
   Response addScriptToEvaluateOnLoad(const String& scriptSource,
                                      String* identifier) override;
   Response removeScriptToEvaluateOnLoad(const String& identifier) override;
   Response setAutoAttachToCreatedPages(bool) override;
   Response reload(Maybe<bool> bypassCache,
                   Maybe<String> scriptToEvaluateOnLoad) override;
   Response navigate(const String& url, String* frameId) override;
+  Response stopLoading() override;
   Response getResourceTree(
       std::unique_ptr<protocol::Page::FrameResourceTree>* frameTree) override;
   void getResourceContent(const String& frameId,
                           const String& url,
                           std::unique_ptr<GetResourceContentCallback>) override;
   void searchInResource(const String& frameId,
                         const String& url,
                         const String& query,
                         Maybe<bool> caseSensitive,
                         Maybe<bool> isRegex,
@@ skipping 72 matching lines @@
   String m_scriptToEvaluateOnLoadOnce;
   bool m_enabled;
   bool m_reloading;
   Member<InspectorResourceContentLoader> m_inspectorResourceContentLoader;
   int m_resourceContentLoaderClientId;
 };
 
 }  // namespace blink
 
 #endif  // !defined(InspectorPagerAgent_h)