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

third_party/WebKit/Source/platform/mojo/MojoHelper.h

Index: third_party/WebKit/Source/platform/mojo/MojoHelper.h
diff --git a/third_party/WebKit/Source/platform/mojo/MojoHelper.h b/third_party/WebKit/Source/platform/mojo/MojoHelper.h
index 073e84ed9fe05d828ef33a839aefdce7d71df036..8f0f00d2dabc823478b68f84da6cb006c9c7f7e3 100644
--- a/third_party/WebKit/Source/platform/mojo/MojoHelper.h
+++ b/third_party/WebKit/Source/platform/mojo/MojoHelper.h
@@ -5,6 +5,7 @@
 #ifndef MojoHelper_h
 #define MojoHelper_h
 
+#include "base/message_loop/message_loop.h"
 #include "mojo/public/cpp/bindings/wtf_array.h"
 #include "platform/heap/HeapAllocator.h"
 #include <utility>
@@ -26,4 +27,16 @@ struct TypeConverter<WTFArray<T>, blink::HeapVector<E>> {
 
 }  // namespace mojo
 
+namespace blink {
+
+// Used to get whether message loop is ready for current thread, to help
+// blink::initialize() determining whether can initialize mojo stuff or not.
+// TODO(leonhsl): http://crbug.com/660274 Remove this API by ensuring
+// a message loop before calling blink::initialize().
+inline bool canInitializeMojo() {
+  return base::MessageLoop::current();
+}
+
+}  // namespace blink
+
 #endif  // MojoHelper_h