Add method to set start source info from launcher

Bug: 166614700
Test: Enable statsd log: "adb shell cmd stats print-logs"
      Launch app from launcher check logcat ((48)0x10000).
Change-Id: Ifc944c5ae9f33147eb7e8768d3e6d1548d20a95a

packages/SystemUI/shared/src/com/android/systemui/shared/system/ActivityOptionsCompat.java

@@ -86,4 +86,12 @@ public abstract class ActivityOptionsCompat {
         opts.setFreezeRecentTasksReordering();
         return opts;
     }
+
+    /**
+     * Sets the launch event time from launcher.
+     */
+    public static ActivityOptions setLauncherSourceInfo(ActivityOptions opts, long uptimeMillis) {
+        opts.setSourceInfo(ActivityOptions.SourceInfo.TYPE_LAUNCHER, uptimeMillis);
+        return opts;
+    }
 }