DCHECK if shader compilation fails that it's due to context loss.

gpu/command_buffer/client/gles2_interface_stub.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.
 
 #include "gpu/command_buffer/client/gles2_interface_stub.h"
 
 namespace gpu {
 namespace gles2 {
 
 GLES2InterfaceStub::GLES2InterfaceStub() {
 }
 
 GLES2InterfaceStub::~GLES2InterfaceStub() {
 }
 
 // Include the auto-generated part of this class. 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 "gpu/command_buffer/client/gles2_interface_stub_impl_autogen.h"
 
+GLboolean GLES2InterfaceStub::IsContextLost() {
+  return false;
+}
+
 }  // namespace gles2
 }  // namespace gpu