Add a test api for checking if system supports TaskSnapshot

Use this test api to make sure testing
KeyboardVisibilityControlTest#testRestoreImeVisibility_.* that
requires the system supporting TaskSnapshot mechanism, otherwise skip
the test when the system doesn't support it.

Bug: 184978234
Test: m checkapi & atest KeyboardVisibilityControlTest
Change-Id: I777053aeeb6a2734a4bbd37711cf56ced41c1bd9

1 files changed, 9 insertions, 0 deletions

diff --git a/core/java/android/view/WindowManager.java b/core/java/android/view/WindowManager.java
index 4b56fd740e8d..d71bbb527a9f 100644
--- a/core/java/android/view/WindowManager.java
+++ b/core/java/android/view/WindowManager.java
@@ -4544,4 +4544,13 @@ public interface WindowManager extends ViewManager {
     default void holdLock(IBinder token, int durationMs) {
         throw new UnsupportedOperationException();
     }
+
+    /**
+     * Used for testing to check if the system supports TaskSnapshot mechanism.
+     * @hide
+     */
+    @TestApi
+    default boolean isTaskSnapshotSupported() {
+        return false;
+    }
 }