Coverity fixes for uninitialized vars

gpu/command_buffer/service/command_buffer_service.cc

 // Copyright (c) 2011 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/command_buffer_service.h"
 
 #include <limits>
 
 #include "base/process_util.h"
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
 
 using ::base::SharedMemory;
 
 namespace gpu {
 
 CommandBufferService::CommandBufferService()
     : ring_buffer_id_(-1),
       num_entries_(0),
       get_offset_(0),
       put_offset_(0),
       token_(0),
       generation_(0),
-      error_(error::kNoError) {
+      error_(error::kNoError),
+      context_lost_reason_(error::kUnknown) {
   // Element zero is always NULL.
   registered_objects_.push_back(Buffer());
 }
 
 CommandBufferService::~CommandBufferService() {
   for (size_t i = 0; i < registered_objects_.size(); ++i) {
     if (registered_objects_[i].shared_memory)
       delete registered_objects_[i].shared_memory;
   }
 }
@@ skipping 204 matching lines @@
     const GetBufferChangedCallback& callback) {
   get_buffer_change_callback_ = callback;
 }
 
 void CommandBufferService::SetParseErrorCallback(
     const base::Closure& callback) {
   parse_error_callback_ = callback;
 }
 
 }  // namespace gpu