gpu: Generate mailboxes on client side

cc/resources/video_resource_updater.cc

 // Copyright 2013 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 "cc/resources/video_resource_updater.h"
 
 #include "base/bind.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/resources/resource_provider.h"
 #include "gpu/GLES2/gl2extchromium.h"
@@ skipping 195 matching lines @@
                                              output_resource_format);
 
       DCHECK(mailbox.IsZero());
 
       if (!software_compositor) {
         DCHECK(context_provider_);
 
         gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
 
         GLC(gl, gl->GenMailboxCHROMIUM(mailbox.name));
-        if (mailbox.IsZero()) {
-          resource_provider_->DeleteResource(resource_id);
-          resource_id = 0;
-        } else {
-          ResourceProvider::ScopedWriteLockGL lock(
-              resource_provider_, resource_id);
-          GLC(gl, gl->BindTexture(GL_TEXTURE_2D, lock.texture_id()));
-          GLC(gl, gl->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name));
-          GLC(gl, gl->BindTexture(GL_TEXTURE_2D, 0));
-        }
+        ResourceProvider::ScopedWriteLockGL lock(resource_provider_,
+                                                 resource_id);
+        GLC(gl, gl->BindTexture(GL_TEXTURE_2D, lock.texture_id()));
+        GLC(gl, gl->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name));
+        GLC(gl, gl->BindTexture(GL_TEXTURE_2D, 0));
       }
 
       if (resource_id)
         all_resources_.push_back(resource_id);
     }
 
     if (resource_id == 0) {
       allocation_success = false;
       break;
     }
@@ skipping 154 matching lines @@
   }
 
   PlaneResource recycled_resource(data.resource_id,
                                   data.resource_size,
                                   data.resource_format,
                                   data.mailbox);
   updater->recycled_resources_.push_back(recycled_resource);
 }
 
 }  // namespace cc