Revert of Remove remains of webrtc/base (patchset #7 id:120001 of https://codereview.webrtc.org/297…

webrtc/base/logging.h

+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+//   LOG(...) an ostream target that can be used to send formatted
+// output to a variety of logging targets, such as debugger console, stderr,
+// or any LogSink.
+//   The severity level passed as the first argument to the LOGging
+// functions is used as a filter, to limit the verbosity of the logging.
+//   Static members of LogMessage documented below are used to control the
+// verbosity and target of the output.
+//   There are several variations on the LOG macro which facilitate logging
+// of common error conditions, detailed below.
+
+// LOG(sev) logs the given stream at severity "sev", which must be a
+//     compile-time constant of the LoggingSeverity type, without the namespace
+//     prefix.
+// LOG_V(sev) Like LOG(), but sev is a run-time variable of the LoggingSeverity
+//     type (basically, it just doesn't prepend the namespace).
+// LOG_F(sev) Like LOG(), but includes the name of the current function.
+// LOG_T(sev) Like LOG(), but includes the this pointer.
+// LOG_T_F(sev) Like LOG_F(), but includes the this pointer.
+// LOG_GLE(M)(sev [, mod]) attempt to add a string description of the
+//     HRESULT returned by GetLastError.  The "M" variant allows searching of a
+//     DLL's string table for the error description.
+// LOG_ERRNO(sev) attempts to add a string description of an errno-derived
+//     error. errno and associated facilities exist on both Windows and POSIX,
+//     but on Windows they only apply to the C/C++ runtime.
+// LOG_ERR(sev) is an alias for the platform's normal error system, i.e. _GLE on
+//     Windows and _ERRNO on POSIX.
+// (The above three also all have _EX versions that let you specify the error
+// code, rather than using the last one.)
+// LOG_E(sev, ctx, err, ...) logs a detailed error interpreted using the
+//     specified context.
+// LOG_CHECK_LEVEL(sev) (and LOG_CHECK_LEVEL_V(sev)) can be used as a test
+//     before performing expensive or sensitive operations whose sole purpose is
+//     to output logging data at the desired level.
+// Lastly, PLOG(sev, err) is an alias for LOG_ERR_EX.
+
+#ifndef WEBRTC_BASE_LOGGING_H_
+#define WEBRTC_BASE_LOGGING_H_
+
+
+// This header is deprecated and is just left here temporarily during
+// refactoring. See https://bugs.webrtc.org/7634 for more details.
+#include "webrtc/rtc_base/logging.h"
+
+#endif  // WEBRTC_BASE_LOGGING_H_