Create webrtc/base/objc and move some logging code there

webrtc/base/objc/RTCLogging.h

 /*
- * libjingle
- * Copyright 2015 Google Inc.
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *  1. Redistributions of source code must retain the above copyright notice,
- *     this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright notice,
- *     this list of conditions and the following disclaimer in the documentation
- *     and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR 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.
+ *  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.
  */
 
 #import <Foundation/Foundation.h>
 
 // Subset of rtc::LoggingSeverity.
 typedef NS_ENUM(NSInteger, RTCLoggingSeverity) {
   kRTCLoggingSeverityVerbose,
   kRTCLoggingSeverityInfo,
   kRTCLoggingSeverityWarning,
   kRTCLoggingSeverityError,
 };
 
 #if defined(__cplusplus)
-extern "C" void RTCLogEx(RTCLoggingSeverity severity, NSString* logString);
+extern "C" void RTCLogEx(RTCLoggingSeverity severity, NSString* log_string);
 extern "C" void RTCSetMinDebugLogLevel(RTCLoggingSeverity severity);
 extern "C" NSString* RTCFileName(const char* filePath);
 #else
 
 // Wrapper for C++ LOG(sev) macros.
 // Logs the log string to the webrtc logstream for the given severity.
-extern void RTCLogEx(RTCLoggingSeverity severity, NSString* logString);
+extern void RTCLogEx(RTCLoggingSeverity severity, NSString* log_string);
 
 // Wrapper for rtc::LogMessage::LogToDebug.
 // Sets the minimum severity to be logged to console.
 extern void RTCSetMinDebugLogLevel(RTCLoggingSeverity severity);
 
 // Returns the filename with the path prefix removed.
 extern NSString* RTCFileName(const char* filePath);
 
 #endif
 
 // Some convenience macros.
 
 #define RTCLogString(format, ...)                    \
   [NSString stringWithFormat:@"(%@:%d %s): " format, \
       RTCFileName(__FILE__),                         \
       __LINE__,                                      \
       __FUNCTION__,                                  \
       ##__VA_ARGS__]
 
-#define RTCLogFormat(severity, format, ...)                    \
-  do {                                                         \
-    NSString *logString = RTCLogString(format, ##__VA_ARGS__); \
-    RTCLogEx(severity, logString);                             \
+#define RTCLogFormat(severity, format, ...)                     \
+  do {                                                          \
+    NSString* log_string = RTCLogString(format, ##__VA_ARGS__); \
+    RTCLogEx(severity, log_string);                             \
   } while (false)
 
 #define RTCLogVerbose(format, ...)                                \
   RTCLogFormat(kRTCLoggingSeverityVerbose, format, ##__VA_ARGS__) \
 
 #define RTCLogInfo(format, ...)                                   \
   RTCLogFormat(kRTCLoggingSeverityInfo, format, ##__VA_ARGS__)    \
 
 #define RTCLogWarning(format, ...)                                \
   RTCLogFormat(kRTCLoggingSeverityWarning, format, ##__VA_ARGS__) \
 
 #define RTCLogError(format, ...)                                  \
   RTCLogFormat(kRTCLoggingSeverityError, format, ##__VA_ARGS__)   \
 
 #if !defined(NDEBUG)
 #define RTCLogDebug(format, ...) RTCLogInfo(format, ##__VA_ARGS__)
 #else
 #define RTCLogDebug(format, ...) \
   do {                           \
   } while (false)
 #endif
 
 #define RTCLog(format, ...) RTCLogInfo(format, ##__VA_ARGS__)