Add System Tracing capability to Sync Manager

This tracing code is enabled via "systrace.py --set-tags sync"

Change-Id: Ia8bc01adbba345a568405b0ac8ade96e56b40cc1

Author: andrewstadler

core/java/android/content/AbstractThreadedSyncAdapter.java

@@ -21,6 +21,7 @@
 import android.os.IBinder;
 import android.os.Process;
 import android.os.RemoteException;
+import android.os.Trace;
 
 import java.util.HashMap;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -233,9 +234,15 @@ private SyncThread(String name, SyncContext syncContext, String authority,
             mThreadsKey = toSyncKey(account);
         }
 
+        @Override
         public void run() {
             Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
 
+            // Trace this sync instance.  Note, conceptually this should be in
+            // SyncStorageEngine.insertStartSyncEvent(), but the trace functions require unique
+            // threads in order to track overlapping operations, so we'll do it here for now.
+            Trace.traceBegin(Trace.TRACE_TAG_SYNC_MANAGER, mAuthority);
+
             SyncResult syncResult = new SyncResult();
             ContentProviderClient provider = null;
             try {
@@ -250,6 +257,8 @@ public void run() {
                     syncResult.databaseError = true;
                 }
             } finally {
+                Trace.traceEnd(Trace.TRACE_TAG_SYNC_MANAGER);
+
                 if (provider != null) {
                     provider.release();
                 }

core/java/android/os/Trace.java

@@ -36,6 +36,7 @@ public final class Trace {
     public static final long TRACE_TAG_WEBVIEW = 1L << 4;
     public static final long TRACE_TAG_WINDOW_MANAGER = 1L << 5;
     public static final long TRACE_TAG_ACTIVITY_MANAGER = 1L << 6;
+    public static final long TRACE_TAG_SYNC_MANAGER = 1L << 7;
 
     private static final long sEnabledTags = nativeGetEnabledTags();