Merge "Enabling app tracing for Launcher" into udc-qpr-dev am: c41af6d681

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/23536851

Change-Id: Iae51118985235b3fc29d293668c3f99a26d9c3d4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

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);
     }
 }