gpu: Generate mailboxes on client side

cc/output/gl_renderer.cc

 // Copyright 2010 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/output/gl_renderer.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 2228 matching lines @@
 
   if (!request->force_bitmap_result()) {
     bool own_mailbox = !request->has_texture_mailbox();
 
     GLuint texture_id = 0;
     gl_->GenTextures(1, &texture_id);
 
     gpu::Mailbox mailbox;
     if (own_mailbox) {
       GLC(gl_, gl_->GenMailboxCHROMIUM(mailbox.name));
-      if (mailbox.IsZero()) {
-        gl_->DeleteTextures(1, &texture_id);
-        request->SendEmptyResult();
-        return;
-      }
     } else {
       mailbox = request->texture_mailbox().mailbox();
       DCHECK_EQ(static_cast<unsigned>(GL_TEXTURE_2D),
                 request->texture_mailbox().target());
       DCHECK(!mailbox.IsZero());
       unsigned incoming_sync_point = request->texture_mailbox().sync_point();
       if (incoming_sync_point)
         GLC(gl_, gl_->WaitSyncPointCHROMIUM(incoming_sync_point));
     }
 
@@ skipping 778 matching lines @@
   is_scissor_enabled_ = false;
   GLC(gl_, gl_->Disable(GL_SCISSOR_TEST));
   scissor_rect_needs_reset_ = true;
 }
 
 bool GLRenderer::IsContextLost() {
   return output_surface_->context_provider()->IsContextLost();
 }
 
 }  // namespace cc