gpu: Generate mailboxes on client side

content/common/gpu/client/gl_helper.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/common/gpu/client/gl_helper.h"
 
 #include <queue>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 809 matching lines @@
 uint32 GLHelper::InsertSyncPoint() { return gl_->InsertSyncPointCHROMIUM(); }
 
 void GLHelper::WaitSyncPoint(uint32 sync_point) {
   gl_->WaitSyncPointCHROMIUM(sync_point);
 }
 
 gpu::MailboxHolder GLHelper::ProduceMailboxHolderFromTexture(
     GLuint texture_id) {
   gpu::Mailbox mailbox;
   gl_->GenMailboxCHROMIUM(mailbox.name);
-  if (mailbox.IsZero())
-    return gpu::MailboxHolder();
   content::ScopedTextureBinder<GL_TEXTURE_2D> texture_binder(gl_, texture_id);
   gl_->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
   return gpu::MailboxHolder(mailbox, GL_TEXTURE_2D, InsertSyncPoint());
 }
 
 GLuint GLHelper::ConsumeMailboxToTexture(const gpu::Mailbox& mailbox,
                                          uint32 sync_point) {
   if (mailbox.IsZero())
     return 0;
   if (sync_point)
@@ skipping 393 matching lines @@
   return copy_texture_to_impl_->CreateReadbackPipelineYUV(quality,
                                                           src_size,
                                                           src_subrect,
                                                           dst_size,
                                                           dst_subrect,
                                                           flip_vertically,
                                                           use_mrt);
 }
 
 }  // namespace content