The big Keyguard transition refactor (8/n)

Don't force mKeyguardGoingAway, as this never recovers. Make sure
to only show the dismissing Keyguard activtiy and recover the
state when trusted state changes.

Test: Make sure Keyguard is in a trusted state, start an activity
with FLAG_DISMISS_KEYGUARD from FLAG_SHOW_WHEN_LOCKED activity
and make sure there is no flicker.

Bug: 32057734
Change-Id: I5d212f6f9d5430250b22c8370f45dc95756432d2

core/java/android/app/ActivityManagerInternal.java

@@ -194,4 +194,9 @@ public abstract class ActivityManagerInternal {
      * @return {@code true} if system is ready, {@code false} otherwise.
      */
     public abstract boolean isSystemReady();
+
+    /**
+     * Called when the trusted state of Keyguard has changed.
+     */
+    public abstract void notifyKeyguardTrustedChanged();
 }

core/java/android/view/WindowManagerPolicy.java

@@ -509,6 +509,11 @@ public interface WindowManagerPolicy {
          * Notifies window manager that {@link #isShowingDreamLw} has changed.
          */
         void notifyShowingDreamChanged();
+
+        /**
+         * Notifies window manager that {@link #isKeyguardTrustedLw} has changed.
+         */
+        void notifyKeyguardTrustedChanged();
     }
 
     public interface PointerEventListener {