Optionally clear PlatformCanvas instances.

content/plugin/webplugin_proxy.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 "content/plugin/webplugin_proxy.h"
 
 #include "build/build_config.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 464 matching lines @@
   // in our address space, or go wrong in some other way.
   HANDLE section;
   DuplicateHandle(channel_->renderer_handle(), dib_handle, GetCurrentProcess(),
                   &section,
                   STANDARD_RIGHTS_REQUIRED | FILE_MAP_READ | FILE_MAP_WRITE,
                   FALSE, 0);
   scoped_ptr<skia::PlatformCanvas> canvas(new skia::PlatformCanvas);
   if (!canvas->initialize(
           window_rect.width(),
           window_rect.height(),
-          true,
+          skia::PlatformDevice::FLAGS_OPAQUE |
+              skia::PlatformDevice::FLAGS_INITIALIZED,

[Jeff Timanus, 2012/02/23 22:14:10]

This initialization is within a #if WIN block, so an explicit erase would be ok.

           section)) {
     canvas_out->reset();
   }
   canvas_out->reset(canvas.release());
   // The canvas does not own the section so we need to close it now.
   CloseHandle(section);
 }
 
 void WebPluginProxy::SetWindowlessBuffers(
     const TransportDIB::Handle& windowless_buffer0,
@@ skipping 279 matching lines @@
   // Retrieve the IME status from a plug-in and send it to a renderer process
   // when the plug-in has updated it.
   int input_type;
   gfx::Rect caret_rect;
   if (!delegate_->GetIMEStatus(&input_type, &caret_rect))
     return;
 
   Send(new PluginHostMsg_NotifyIMEStatus(route_id_, input_type, caret_rect));
 }
 #endif