Add libjingle-style stream-style logging.

Add a highly stripped-down version of libjingle's base/logging.h. It is
a thin wrapper around WEBRTC_TRACE, maintaining the libjingle log
semantics to ease a transition to that format.

Also add some helper macros for easy API and function failure logging.

Review URL: https://webrtc-codereview.appspot.com/931010

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3099 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/common_types.h b/webrtc/common_types.h
index 83c55a3..f5d55d7 100644
--- a/webrtc/common_types.h
+++ b/webrtc/common_types.h
@@ -57,6 +57,7 @@
 
 enum TraceModule
 {
+    kTraceUndefined          = 0,
     // not a module, triggered from the engine code
     kTraceVoice              = 0x0001,
     // not a module, triggered from the engine code