Enabling app tracing for Launcher

Bug: 273718665
Test: None
Flag: N/A
Change-Id: Ie6fa50b602bf180dd5dcba999c9e18f07a17d589

quickstep/src/com/android/quickstep/QuickstepProcessInitializer.java

@@ -19,6 +19,8 @@ import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.os.Build;
+import android.os.Looper;
+import android.os.Trace;
 import android.os.UserManager;
 import android.util.Log;
 import android.view.ThreadedRenderer;
@@ -60,5 +62,9 @@ public class QuickstepProcessInitializer extends MainProcessInitializer {
         // Elevate GPU priority for Quickstep and Remote animations.
         ThreadedRenderer.setContextPriority(
                 ThreadedRenderer.EGL_CONTEXT_PRIORITY_HIGH_IMG);
+
+        // Enable Looper trace points.
+        // This allows us to see Handler callbacks on traces.
+        Looper.getMainLooper().setTraceTag(Trace.TRACE_TAG_APP);
     }
 }