AudioFlinger: Replace track name with id

Simplifies Mixer handling, makes debug messages consistent.

Test: Audio sanity test, check logcat
Bug: 115435564
Change-Id: I216e2746170605dfb7994ac660c5534869e887fe
diff --git a/services/audioflinger/TrackBase.h b/services/audioflinger/TrackBase.h
index a43cb75..92e79f2 100644
--- a/services/audioflinger/TrackBase.h
+++ b/services/audioflinger/TrackBase.h
@@ -54,11 +54,6 @@
         TYPE_PATCH,
     };
 
-    enum {
-        TRACK_NAME_PENDING = -1,
-        TRACK_NAME_FAILURE = -2,
-    };
-
                         TrackBase(ThreadBase *thread,
                                 const sp<Client>& client,
                                 const audio_attributes_t& mAttr,
@@ -199,6 +194,7 @@
                         }
 
            audio_format_t format() const { return mFormat; }
+           int id() const { return mId; }
 
 protected:
     DISALLOW_COPY_AND_ASSIGN(TrackBase);