Simplify platform_canvas.h by recognizing that PlatformCanvas does not actually extend

chrome/renderer/safe_browsing/phishing_thumbnailer.cc

 // Copyright (c) 2010 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/renderer/safe_browsing/phishing_thumbnailer.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "content/public/renderer/render_view.h"
@@ skipping 14 matching lines @@
 namespace safe_browsing {
 
 SkBitmap GrabPhishingThumbnail(content::RenderView* render_view,
                                const gfx::Size& view_size,
                                const gfx::Size& thumbnail_size) {
   if (!render_view || !render_view->GetWebView()) {
     return SkBitmap();  // The WebView is going away.
   }
   WebView* view = render_view->GetWebView();
   base::TimeTicks beginning_time = base::TimeTicks::Now();
-  skia::PlatformCanvas canvas;
-  if (!canvas.initialize(view_size.width(), view_size.height(), true)) {
+  SkCanvas* canvas = skia::CreatePlatformCanvas(view_size.width(),
+                                                view_size.height(), true, 0,
+                                                skia::RETURN_NULL_ON_FAILURE);
+  if (!canvas)
     return SkBitmap();
-  }
+  SkAutoUnref au(canvas);
 
   // Make sure we are not using any zoom when we take the snapshot.  We will
   // restore the previous zoom level after the snapshot is taken.
   double old_zoom_level = view->zoomLevel();
   if (view->zoomLevel() != 0.0) {
     view->setZoomLevel(false, 0.0);
   }
   WebSize old_size = view->size();
   // TODO(noelutz): not only should we hide all scroll bars but we should also
   // make sure that all scroll-bars are at the top.
   view->mainFrame()->setCanHaveScrollbars(false);  // always hide scrollbars.
   view->resize(view_size);
   view->layout();
-  view->paint(webkit_glue::ToWebCanvas(&canvas),
+  view->paint(webkit_glue::ToWebCanvas(canvas),
               WebRect(0, 0, view_size.width(), view_size.height()));
 
-  SkDevice* device = skia::GetTopDevice(canvas);
+  SkDevice* device = skia::GetTopDevice(*canvas);
 
   // Now resize the thumbnail to the right size.  Note: it is important that we
   // use this resize algorithm here.
   const SkBitmap& bitmap = device->accessBitmap(false);
   SkBitmap thumbnail = skia::ImageOperations::Resize(
       bitmap,
       skia::ImageOperations::RESIZE_LANCZOS3,
       thumbnail_size.width(),
       thumbnail_size.height());
 
   // Put things back as they were before.
   if (view->zoomLevel() != old_zoom_level) {
     view->setZoomLevel(false, old_zoom_level);
   }
   // Maybe re-display the scrollbars and resize the view to its old size.
   view->mainFrame()->setCanHaveScrollbars(
       render_view->ShouldDisplayScrollbars(old_size.width, old_size.height));
   view->resize(old_size);
 
   UMA_HISTOGRAM_TIMES("SBClientPhishing.GrabPhishingThumbnail",
                       base::TimeTicks::Now() - beginning_time);
   return thumbnail;
 }
 
 }  // namespace safe_browsing