Revert of Report lost context from GLES2Implementation based on share group state.

components/mus/gles2/command_buffer_local.cc

 // Copyright 2015 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 "components/mus/gles2/command_buffer_local.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/memory/shared_memory.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 316 matching lines @@
   gpu_state_->command_buffer_task_runner()->PostTask(
       driver_.get(), base::Bind(&CommandBufferLocal::SignalQueryOnGpuThread,
                                 base::Unretained(this), query_id, callback));
 }
 
 void CommandBufferLocal::SetLock(base::Lock* lock) {
   DCHECK(CalledOnValidThread());
   NOTIMPLEMENTED();
 }
 
+bool CommandBufferLocal::IsGpuChannelLost() {
+  DCHECK(CalledOnValidThread());
+  // This is only possible for out-of-process command buffers.
+  return false;
+}
+
 void CommandBufferLocal::EnsureWorkVisible() {
   // This is only relevant for out-of-process command buffers.
 }
 
 gpu::CommandBufferNamespace CommandBufferLocal::GetNamespaceID() const {
   DCHECK(CalledOnValidThread());
   return gpu::CommandBufferNamespace::MOJO_LOCAL;
 }
 
 gpu::CommandBufferId CommandBufferLocal::GetCommandBufferID() const {
@@ skipping 231 matching lines @@
     client_->UpdateVSyncParameters(timebase, interval);
 }
 
 void CommandBufferLocal::OnGpuCompletedSwapBuffersOnClientThread(
     gfx::SwapResult result) {
   if (client_)
     client_->GpuCompletedSwapBuffers(result);
 }
 
 }  // namespace mus