Fix snapshotting on linux by creating a separate automation path for

chrome/renderer/automation/automation_renderer_helper.h

 // Copyright (c) 2011 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 CHROME_RENDERER_AUTOMATION_AUTOMATION_RENDERER_HELPER_H_
 #define CHROME_RENDERER_AUTOMATION_AUTOMATION_RENDERER_HELPER_H_
 #pragma once
 
+#include <string>
+#include <vector>
+
 #include "content/public/renderer/render_view_observer.h"
+#include "content/public/renderer/render_view_observer_tracker.h"
 
 namespace WebKit {
 class WebFrame;
 class WebURL;
+class WebView;
 }
 
 // Filters automation/testing messages sent to a |RenderView| and sends
 // automation/testing messages to the browser.
-class AutomationRendererHelper : public content::RenderViewObserver {
+class AutomationRendererHelper
+    : public content::RenderViewObserver,
+      public content::RenderViewObserverTracker<AutomationRendererHelper> {
  public:
   explicit AutomationRendererHelper(content::RenderView* render_view);
   virtual ~AutomationRendererHelper();
 
+  // Takes a snapshot of the entire page without changing layout size.
+  bool SnapshotEntirePage(WebKit::WebView* view,
+                          std::vector<unsigned char>* png_data,
+                          std::string* error_msg);
+
  private:
+  void OnSnapshotEntirePage();
+
   // RenderViewObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message);
   virtual void WillPerformClientRedirect(
       WebKit::WebFrame* frame, const WebKit::WebURL& from,
       const WebKit::WebURL& to, double interval, double fire_time);
   virtual void DidCancelClientRedirect(WebKit::WebFrame* frame);
   virtual void DidCompleteClientRedirect(WebKit::WebFrame* frame,
                                          const WebKit::WebURL& from);
 
   DISALLOW_COPY_AND_ASSIGN(AutomationRendererHelper);
 };
 
 #endif  // CHROME_RENDERER_AUTOMATION_AUTOMATION_RENDERER_HELPER_H_