Optionally clear PlatformCanvas instances.

ui/gfx/surface/transport_dib_win.cc

 // Copyright (c) 2011 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 "ui/gfx/surface/transport_dib.h"
 
 #include <windows.h>
 
 #include <limits>
 
@@ skipping 53 matching lines @@
 bool TransportDIB::is_valid_id(TransportDIB::Id id) {
   return is_valid_handle(id.handle);
 }
 
 skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
   // This DIB already mapped the file into this process, but PlatformCanvas
   // will map it again.
   DCHECK(!memory()) << "Mapped file twice in the same process.";
 
   scoped_ptr<skia::PlatformCanvas> canvas(new skia::PlatformCanvas);
-  if (!canvas->initialize(w, h, true, handle()))
+  if (!canvas->initialize(
+          w, h,
+          skia::PlatformDevice::FLAGS_OPAQUE |
+              skia::PlatformDevice::FLAGS_INITIALIZED,
+          handle()))
     return NULL;
   return canvas.release();
 }
 
 bool TransportDIB::Map() {
   if (!is_valid_handle(handle()))
     return false;
   if (memory())
     return true;
 
@@ skipping 16 matching lines @@
   return shared_memory_.memory();
 }
 
 TransportDIB::Handle TransportDIB::handle() const {
   return shared_memory_.handle();
 }
 
 TransportDIB::Id TransportDIB::id() const {
   return Id(handle(), sequence_num_);
 }