Allow WebExternalTextureLayers to receive a bitmap along with a mailbox

webkit/renderer/compositor_bindings/web_external_texture_layer_impl.cc

 // Copyright 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 "webkit/renderer/compositor_bindings/web_external_texture_layer_impl.h"
 
 #include "cc/layers/texture_layer.h"
 #include "cc/resources/resource_update_queue.h"
 #include "third_party/WebKit/public/platform/WebExternalTextureLayerClient.h"
 #include "third_party/WebKit/public/platform/WebExternalTextureMailbox.h"
@@ skipping 92 matching lines @@
 }
 
 WebKit::WebGraphicsContext3D* WebExternalTextureLayerImpl::Context3d() {
   DCHECK(client_);
   return client_->context();
 }
 
 bool WebExternalTextureLayerImpl::PrepareTextureMailbox(
     cc::TextureMailbox* mailbox) {
   WebKit::WebExternalTextureMailbox client_mailbox;
-  if (!client_->prepareMailbox(&client_mailbox)) {
+  bool use_bitmap =
+      static_cast<TextureLayer*>(layer_->layer())->MustUseBitmap();
+  if (!client_->prepareMailbox(&client_mailbox, use_bitmap)) {
     return false;
   }
+
   gpu::Mailbox name;
   name.SetName(client_mailbox.name);
   cc::TextureMailbox::ReleaseCallback callback =
       base::Bind(&WebExternalTextureLayerImpl::DidReleaseMailbox,
                  this->AsWeakPtr(),
                  client_mailbox);
-  *mailbox = cc::TextureMailbox(name, callback, client_mailbox.syncPoint);
+  if (use_bitmap)
+    *mailbox = cc::TextureMailbox(client_mailbox.bitmap,
+                                  client_mailbox.size,
+                                  callback);
+  else
+    *mailbox = cc::TextureMailbox(name, callback, client_mailbox.syncPoint);
   return true;
 }
 
 void WebExternalTextureLayerImpl::DidReleaseMailbox(
     const WebKit::WebExternalTextureMailbox& mailbox,
     unsigned sync_point,
     bool lost_resource) {
   if (lost_resource)
     return;
 
   WebKit::WebExternalTextureMailbox available_mailbox;
   memcpy(available_mailbox.name, mailbox.name, sizeof(available_mailbox.name));
   available_mailbox.syncPoint = sync_point;
+  available_mailbox.bitmap = mailbox.bitmap;
+  available_mailbox.size = mailbox.size;
   client_->mailboxReleased(available_mailbox);
 }
 
 }  // namespace webkit