Optionally clear PlatformCanvas instances.

chrome/renderer/chrome_render_view_observer.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/renderer/chrome_render_view_observer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 142 matching lines @@
 // Constants for mixed-content blocking.
 static const char kGoogleDotCom[] = "google.com";
 static const char kFacebookDotCom[] = "facebook.com";
 static const char kTwitterDotCom[] = "twitter.com";
 
 static bool PaintViewIntoCanvas(WebView* view,
                                 skia::PlatformCanvas& canvas) {
   view->layout();
   const WebSize& size = view->size();
 
-  if (!canvas.initialize(size.width, size.height, true))
+  if (!canvas.initialize(size.width, size.height,
+                         skia::PlatformDevice::FLAGS_OPAQUE))
     return false;
 
   view->paint(webkit_glue::ToWebCanvas(&canvas),
               WebRect(0, 0, size.width, size.height));
   // TODO: Add a way to snapshot the whole page, not just the currently
   // visible part.
 
   return true;
 }
 
@@ skipping 875 matching lines @@
         reinterpret_cast<const unsigned char*>(&data[0]);
 
     return decoder.Decode(src_data, data.size());
   }
   return SkBitmap();
 }
 
 bool ChromeRenderViewObserver::IsStrictSecurityHost(const std::string& host) {
   return (strict_security_hosts_.find(host) != strict_security_hosts_.end());
 }