Restore SnapshotTabHelper temporarily

chrome/renderer/chrome_render_view_observer.h

 // Copyright (c) 2012 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_CHROME_RENDER_VIEW_OBSERVER_H_
 #define CHROME_RENDERER_CHROME_RENDER_VIEW_OBSERVER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 108 matching lines @@
       WebKit::WebFrame* frame,
       bool allowed_per_settings,
       const WebKit::WebSecurityOrigin& context,
       const WebKit::WebURL& url) OVERRIDE;
   virtual void Navigate(const GURL& url) OVERRIDE;
 
   void OnWebUIJavaScript(const string16& frame_xpath,
                          const string16& jscript,
                          int id,
                          bool notify_result);
+  void OnCaptureSnapshot();
   void OnHandleMessageFromExternalHost(const std::string& message,
                                        const std::string& origin,
                                        const std::string& target);
   void OnJavaScriptStressTestControl(int cmd, int param);
   void OnSetIsPrerendering(bool is_prerendering);
   void OnSetAllowDisplayingInsecureContent(bool allow);
   void OnSetAllowRunningInsecureContent(bool allow);
   void OnSetClientSidePhishingDetection(bool enable_phishing_detection);
   void OnSetVisuallyDeemphasized(bool deemphasized);
   void OnStartFrameSniffer(const string16& frame_name);
   void OnGetFPS();
   void OnAddStrictSecurityHost(const std::string& host);
 
   void CapturePageInfoLater(bool preliminary_capture, base::TimeDelta delay);
 
   // Captures the thumbnail and text contents for indexing for the given load
   // ID.  Kicks off analysis of the captured text.
   void CapturePageInfo(bool preliminary_capture);
 
   // Retrieves the text from the given frame contents, the page text up to the
   // maximum amount kMaxIndexChars will be placed into the given buffer.
   void CaptureText(WebKit::WebFrame* frame, string16* contents);
 
+  // Capture a snapshot of a view.  This is used to allow an extension
+  // to get a snapshot of a tab using chrome.tabs.captureVisibleTab().
+  bool CaptureSnapshot(WebKit::WebView* view, SkBitmap* snapshot);
+
   ExternalHostBindings* GetExternalHostBindings();
 
   // Determines if a host is in the strict security host set.
   bool IsStrictSecurityHost(const std::string& host);
 
   // If |origin| corresponds to an installed extension, returns that extension.
   // Otherwise returns NULL.
   const extensions::Extension* GetExtension(
       const WebKit::WebSecurityOrigin& origin) const;
 
@@ skipping 28 matching lines @@
   // A color page overlay when visually de-emaphasized.
   scoped_ptr<WebViewColorOverlay> dimmed_color_overlay_;
 
   // Used to delay calling CapturePageInfo.
   base::Timer capture_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderViewObserver);
 };
 
 #endif  // CHROME_RENDERER_CHROME_RENDER_VIEW_OBSERVER_H_