Introduce PlatformBitmap, which is a minimal helper class that wraps an SkBitmap

chrome/browser/extensions/api/tabs/tabs.cc

 // 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.
 
 #include "chrome/browser/extensions/api/tabs/tabs.h"
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 1666 matching lines @@
         &error_)) {
     return false;
   }
 
   RenderViewHost* render_view_host = web_contents->GetRenderViewHost();
   content::RenderWidgetHostView* view = render_view_host->GetView();
   if (!view) {
     error_ = keys::kInternalVisibleTabCaptureError;
     return false;
   }
-  skia::PlatformCanvas* temp_canvas = new skia::PlatformCanvas;
+  skia::PlatformBitmap* temp_bitmap = new skia::PlatformBitmap;
   render_view_host->CopyFromBackingStore(
       gfx::Rect(),
       view->GetViewBounds().size(),
       base::Bind(&CaptureVisibleTabFunction::CopyFromBackingStoreComplete,
                  this,
-                 base::Owned(temp_canvas)),
-      temp_canvas);
+                 base::Owned(temp_bitmap)),
+      temp_bitmap);
   return true;
 }
 
 void CaptureVisibleTabFunction::CopyFromBackingStoreComplete(
-    skia::PlatformCanvas* canvas,
+    skia::PlatformBitmap* bitmap,
     bool succeeded) {
   if (succeeded) {
     VLOG(1) << "captureVisibleTab() got image from backing store.";
-    SendResultFromBitmap(skia::GetTopDevice(*canvas)->accessBitmap(false));
+    SendResultFromBitmap(bitmap->GetBitmap());
     return;
   }
 
   WebContents* web_contents = NULL;
   if (!GetTabToCapture(&web_contents)) {
     error_ = keys::kInternalVisibleTabCaptureError;
     SendResponse(false);
     return;
   }
 
@@ skipping 153 matching lines @@
   // called for every API call the extension made.
   GotLanguage(language);
 }
 
 void DetectTabLanguageFunction::GotLanguage(const std::string& language) {
   SetResult(Value::CreateStringValue(language.c_str()));
   SendResponse(true);
 
   Release();  // Balanced in Run()
 }