Fix snapshotting on linux by creating a separate automation path for

chrome/renderer/automation/automation_renderer_helper.h

Index: chrome/renderer/automation/automation_renderer_helper.h
diff --git a/chrome/renderer/automation/automation_renderer_helper.h b/chrome/renderer/automation/automation_renderer_helper.h
index f83cf4dad2a9ac9f6a5fd95dd2c0ee8a21212613..fc17c4da41558d73c86d0ffaa5219b11a0625df4 100644
--- a/chrome/renderer/automation/automation_renderer_helper.h
+++ b/chrome/renderer/automation/automation_renderer_helper.h
@@ -6,22 +6,37 @@
 #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);