Add logging to debug incorrect taskbar states caught by flaky tests.

- Various TAPL tasts are flaking because the taskbar is present when navigating home. Several TAPL taskbar tests are also flaking because the taskbar is missing when opening an app. Adding logging to catch when FLAG_IN_APP is being set and why it isn't being applied.

Bug: 227657604
Bug: 225205246
Test: manual
Change-Id: Ia976bb0a6c7764e571fab3ac98ee21ff22ef7674

quickstep/src/com/android/launcher3/taskbar/TaskbarStashController.java

@@ -28,10 +28,12 @@ import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.annotation.Nullable;
 import android.content.SharedPreferences;
+import android.util.Log;
 import android.view.ViewConfiguration;
 
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Utilities;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.util.MultiValueAlpha.AlphaProperty;
 import com.android.quickstep.AnimatedFloat;
 import com.android.quickstep.SystemUiProxy;
@@ -556,6 +558,10 @@ public class TaskbarStashController implements TaskbarControllers.LoggableTaskba
      *                unstashed.
      */
     public void updateStateForFlag(int flag, boolean enabled) {
+        if (flag == FLAG_IN_APP && TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.TASKBAR_IN_APP_STATE, String.format(
+                    "setting flag FLAG_IN_APP to: %b", enabled), new Exception());
+        }
         if (enabled) {
             mState |= flag;
         } else {
@@ -653,6 +659,14 @@ public class TaskbarStashController implements TaskbarControllers.LoggableTaskba
             }
             boolean isStashed = mStashCondition.test(flags);
             if (mIsStashed != isStashed) {
+                if (TestProtocol.sDebugTracing) {
+                    Log.d(TestProtocol.TASKBAR_IN_APP_STATE, String.format(
+                            "setState: mIsStashed=%b, isStashed=%b, duration=%d, start=:%b",
+                            mIsStashed,
+                            isStashed,
+                            duration,
+                            start));
+                }
                 mIsStashed = isStashed;
 
                 // This sets mAnimator.