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

webrtc/base/base.gyp

Index: webrtc/base/base.gyp
diff --git a/webrtc/base/base.gyp b/webrtc/base/base.gyp
index 44aff84c43019156a3fa71a59b88e83051a8b7dc..23a3c26c77081330f6f273dba4e55e6b232addea 100644
--- a/webrtc/base/base.gyp
+++ b/webrtc/base/base.gyp
@@ -22,6 +22,27 @@
         }],
       ],
     }],
+    # TODO(tkchin): Mac support. There are a bunch of problems right now because
+    # of some settings pulled down from Chromium.
+    ['OS=="ios"', {
+      'targets': [
+        {
+          'target_name': 'rtc_base_objc',
+          'type': 'static_library',
+          'dependencies': [
+            'rtc_base',
+          ],
+          'sources': [
+            'objc/RTCLogging.h',
+            'objc/RTCLogging.mm'
+          ],
+          'xcode_settings': {
+            'CLANG_ENABLE_OBJC_ARC': 'YES',
+            'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
+          },
+        }
+      ],
+    }], # OS=="ios"
   ],
   'targets': [
     {