[TimeZoneMonitor] Decouple renderer side impl from content to blink.

third_party/WebKit/Source/platform/exported/Platform.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "base/message_loop/message_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "platform/Histogram.h"
 #include "platform/PartitionAllocMemoryDumpProvider.h"
 #include "platform/fonts/FontCacheMemoryDumpProvider.h"
 #include "platform/heap/BlinkGCMemoryDumpProvider.h"
 #include "platform/heap/GCTaskRunner.h"
 #include "platform/tracing/MemoryCacheDumpProvider.h"
 #include "public/platform/InterfaceProvider.h"
 #include "public/platform/Platform.h"
@@ skipping 93 matching lines @@
 void Platform::setCurrentPlatformForTesting(Platform* platform) {
   ASSERT(platform);
   s_platform = platform;
   s_platform->m_mainThread = platform->currentThread();
 }
 
 Platform* Platform::current() {
   return s_platform;
 }
 
+bool Platform::isMessageLoopReady() {
+  return base::MessageLoop::current();
+}
+
 WebThread* Platform::mainThread() const {
   return m_mainThread;
 }
 
 InterfaceProvider* Platform::interfaceProvider() {
   return InterfaceProvider::getEmptyInterfaceProvider();
 }
 
 }  // namespace blink