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diff --git a/chromium/mojo/public/c/environment/logger.h b/chromium/mojo/public/c/environment/logger.h
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+++ b/chromium/mojo/public/c/environment/logger.h
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+// 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.
+
+#ifndef MOJO_PUBLIC_C_ENVIRONMENT_LOGGER_H_
+#define MOJO_PUBLIC_C_ENVIRONMENT_LOGGER_H_
+
+#include <stdint.h>
+
+// |MojoLogLevel|: Used to specify the type of log message. Values are ordered
+// by severity (i.e., higher numerical values are more severe).
+
+typedef int32_t MojoLogLevel;
+
+#ifdef __cplusplus
+const MojoLogLevel MOJO_LOG_LEVEL_VERBOSE = -1;
+const MojoLogLevel MOJO_LOG_LEVEL_INFO = 0;
+const MojoLogLevel MOJO_LOG_LEVEL_WARNING = 1;
+const MojoLogLevel MOJO_LOG_LEVEL_ERROR = 2;
+const MojoLogLevel MOJO_LOG_LEVEL_FATAL = 3;
+#else
+#define MOJO_LOG_LEVEL_VERBOSE ((MojoLogLevel) -1)
+#define MOJO_LOG_LEVEL_INFO ((MojoLogLevel) 0)
+#define MOJO_LOG_LEVEL_WARNING ((MojoLogLevel) 1)
+#define MOJO_LOG_LEVEL_ERROR ((MojoLogLevel) 2)
+#define MOJO_LOG_LEVEL_FATAL ((MojoLogLevel) 3)
+#endif
+
+// Structure with basic logging functions (on top of which more friendly logging
+// macros may be built). The functions are thread-safe, except for
+// |SetMinimumLogLevel()| (see below).
+struct MojoLogger {
+  // Logs |message| at level |log_level| if |log_level| is at least the current
+  // minimum log level. If |log_level| is |MOJO_LOG_LEVEL_FATAL| (or greater),
+  // aborts the application/process.
+  void (*LogMessage)(MojoLogLevel log_level, const char* message);
+
+  // Gets the minimum log level (see above), which will always be at most
+  // |MOJO_LOG_LEVEL_FATAL|. (Though |LogMessage()| will automatically avoid
+  // logging messages below the minimum log level, this may be used to avoid
+  // extra work.)
+  MojoLogLevel (*GetMinimumLogLevel)(void);
+
+  // Sets the minimum log level (see above) to the lesser of |minimum_log_level|
+  // and |MOJO_LOG_LEVEL_FATAL|.
+  //
+  // Warning: This function may not be thread-safe, and should not be called
+  // concurrently with other |MojoLogger| functions. (In some environments --
+  // such as Chromium -- that share a logger across applications, this may mean
+  // that it is almost never safe to call this.)
+  void (*SetMinimumLogLevel)(MojoLogLevel minimum_log_level);
+};
+
+#endif  // MOJO_PUBLIC_C_ENVIRONMENT_LOGGER_H_