gpu: Remove Echo and SwapCompletion GL interfacess

gpu/command_buffer/service/in_process_command_buffer.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 "gpu/command_buffer/service/in_process_command_buffer.h"
 
 #include <queue>
 #include <set>
 #include <utility>
 
@@ skipping 685 matching lines @@
 
   gles2::QueryManager::Query* query = query_manager_->GetQuery(query_id);
   if (!query)
     callback.Run();
   else
     query->AddCallback(callback);
 }
 
 void InProcessCommandBuffer::SetSurfaceVisible(bool visible) {}
 
-void InProcessCommandBuffer::Echo(const base::Closure& callback) {
-  QueueTask(WrapCallback(callback));
-}
-
 uint32 InProcessCommandBuffer::CreateStreamTexture(uint32 texture_id) {
   base::WaitableEvent completion(true, false);
   uint32 stream_id = 0;
   base::Callback<uint32(void)> task =
       base::Bind(&InProcessCommandBuffer::CreateStreamTextureOnGpuThread,
                  base::Unretained(this),
                  texture_id);
   QueueTask(
       base::Bind(&RunTaskWithResult<uint32>, task, &stream_id, &completion));
   completion.Wait();
@@ skipping 53 matching lines @@
 
 #if defined(OS_ANDROID)
 scoped_refptr<gfx::SurfaceTexture>
 InProcessCommandBuffer::GetSurfaceTexture(uint32 stream_id) {
   DCHECK(stream_texture_manager_);
   return stream_texture_manager_->GetSurfaceTexture(stream_id);
 }
 #endif
 
 }  // namespace gpu