Mojo: Make GetDefault{AsyncWaiter,Logger} static methods of Environment.

mojo/environment/default_logger_impl.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 "mojo/environment/default_logger_impl.h"
 
 #include "base/logging.h"
 #include "base/macros.h"
 
 namespace mojo {
@@ skipping 33 matching lines @@
   // TODO(vtl): Possibly, we should try to pull out the file and line number
   // from |message|.
   logging::LogMessage(__FILE__, __LINE__, chromium_log_level).stream()
       << message;
 }
 
 MojoLogLevel GetMinimumLogLevel() {
   return ChromiumToMojoLogLevel(logging::GetMinLogLevel());
 }
 
+void SetMinimumLogLevel(MojoLogLevel log_level) {
+  logging::SetMinLogLevel(MojoToChromiumLogLevel(log_level));
+}
+
 const MojoLogger kDefaultLogger = {
   LogMessage,
-  GetMinimumLogLevel
+  GetMinimumLogLevel,
+  SetMinimumLogLevel
 };
 
 }  // namespace
 
 const MojoLogger* GetDefaultLoggerImpl() {
   return &kDefaultLogger;
 }
 
 }  // namespace internal
 }  // namespace mojo