Add iOS tracing.

webrtc/base/base.gyp

 # Copyright (c) 2014 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.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 21 matching lines @@
           'dependencies': [
             'rtc_base',
           ],
           'sources': [
             'objc/NSString+StdString.h',
             'objc/NSString+StdString.mm',
             'objc/RTCDispatcher.h',
             'objc/RTCDispatcher.m',
             'objc/RTCLogging.h',
             'objc/RTCLogging.mm',
+            'objc/RTCMacros.h',
             'objc/RTCSSLAdapter.h',
             'objc/RTCSSLAdapter.mm',
+            'objc/RTCTracing.h',
+            'objc/RTCTracing.mm',
           ],
           'conditions': [
             ['OS=="ios"', {
               'sources': [
                 'objc/RTCCameraPreviewView.h',
                 'objc/RTCCameraPreviewView.m',
               ],
               'all_dependent_settings': {
                 'xcode_settings': {
                   'OTHER_LDFLAGS': [
@@ skipping 684 matching lines @@
           ],
         }, {
           'include_dirs': [
             '<(ssl_root)',
           ],
         }],
       ],
     },
   ],
 }