gpu: Add the ability to wait on upload completion.

gpu/command_buffer/client/gles2_implementation.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.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "../client/gles2_implementation.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 3421 matching lines @@
       "glAsyncTexSubImage2DCHROMIUM", offset, size);
   if (!buffer)
     return;
 
   helper_->AsyncTexSubImage2DCHROMIUM(
       target, level, xoffset, yoffset, width, height, format, type,
       buffer->shm_id(), buffer->shm_offset() + offset);
   return;
 }
 
+void GLES2Implementation::WaitAsyncTexImage2DCHROMIUM(GLenum target) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glWaitAsyncTexImage2DCHROMIUM("
+      << GLES2Util::GetStringTextureTarget(target) << ")");
+  helper_->WaitAsyncTexImage2DCHROMIUM(target);
+  CheckGLError();
+}
+
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "../client/gles2_implementation_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu