Fix device_event_log component build, make NonThreadSafe (Take 2)

components/device_event_log/device_event_log.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 "components/device_event_log/device_event_log.h"
 
 #include <string>
 
 #include "base/logging.h"
+#include "base/thread_task_runner_handle.h"
 #include "components/device_event_log/device_event_log_impl.h"
 
 namespace device_event_log {
 
 namespace {
 
 const size_t kDefaultMaxEntries = 4000;
 
 const int kSlowMethodThresholdMs = 10;
 const int kVerySlowMethodThresholdMs = 50;
 
 DeviceEventLogImpl* g_device_event_log = NULL;
 
 }  // namespace
 
 const LogLevel kDefaultLogLevel = LOG_LEVEL_EVENT;
 
 void Initialize(size_t max_entries) {
   CHECK(!g_device_event_log);
   if (max_entries == 0)
     max_entries = kDefaultMaxEntries;
-  g_device_event_log = new DeviceEventLogImpl(max_entries);
+  g_device_event_log =
+      new DeviceEventLogImpl(base::ThreadTaskRunnerHandle::Get(), max_entries);
+}
+
+bool IsInitialized() {
+  return !!g_device_event_log;
 }
 
 void Shutdown() {
   delete g_device_event_log;
   g_device_event_log = NULL;
 }
 
 void AddEntry(const char* file,
               int line,
               LogType type,
@@ skipping 68 matching lines @@
       level = LOG_LEVEL_ERROR;
     DEVICE_LOG(type_, level) << "@@@ Slow method: " << file_ << ":" << name_
                              << ": " << timer_.Elapsed().InMilliseconds()
                              << "ms";
   }
 }
 
 }  // namespace internal
 
 }  // namespace device_event_log