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

mojo/gles2/command_buffer_client_impl.cc

 // Copyright 2014 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 "mojo/gles2/command_buffer_client_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
@@ skipping 319 matching lines @@
     return;
   }
 
   if (state.generation - last_state_.generation < 0x80000000U)
     last_state_ = state;
 }
 
 void CommandBufferClientImpl::SetLock(base::Lock* lock) {
 }
 
+bool CommandBufferClientImpl::IsGpuChannelLost() {
+  // This is only possible for out-of-process command buffers.
+  return false;
+}
+
 void CommandBufferClientImpl::EnsureWorkVisible() {
   // This is only relevant for out-of-process command buffers.
 }
 
 gpu::CommandBufferNamespace CommandBufferClientImpl::GetNamespaceID() const {
   return gpu::CommandBufferNamespace::MOJO;
 }
 
 gpu::CommandBufferId CommandBufferClientImpl::GetCommandBufferID() const {
   return command_buffer_id_;
@@ skipping 34 matching lines @@
 
   // It is also safe to wait on the same context.
   if (sync_token->namespace_id() == gpu::CommandBufferNamespace::MOJO &&
       sync_token->command_buffer_id() == GetCommandBufferID())
     return true;
 
   return false;
 }
 
 }  // namespace gles2