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

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index db762250a3061da5dcff275fd47ab2f7d5f47d3a..236efc7b02b40e0c7e696c6c07856813a46bd101 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -605,3 +605,19 @@ static_library("rtc_base") {
     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",
+    ]
+  }
+}