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

webrtc/base/BUILD.gn

 # 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 587 matching lines @@
       "linux.cc",
       "linux.h",
     ]
   }
 
   if (is_nacl) {
     deps += [ "//native_client_sdk/src/libraries/nacl_io" ]
     defines += [ "timezone=_timezone" ]
   }
 }
+
+if (is_ios) {
+  static_library("rtc_base_objc") {

[kjellander_webrtc, 2015/11/26 08:36:16]

I believe GN prefers source_set unless static_library is absolutely necessary. I
think they're statically linked by default anyway.

+    deps = [
+      ":rtc_base",
+    ]
+    cflags = [ "-fobjc-arc" ]
+    configs += [ "..:common_config" ]
+    public_configs = [ "..:common_inherited_config" ]
+
+    sources = [
+      "objc/RTCLogging.h",
+      "objc/RTCLogging.mm",
+    ]
+  }
+}