Adds a UiAutomation#clearCache() to be consistent with A11yService.

Includes a @TestApi for CTS testing that the cache was cleared, also
copied from A11yService.

Bug: 263394275
Test: atest AccessibilityCacheTest
Change-Id: Ia5fee5d13c6e4949ae1206edd9f0b22e53f0a437

core/api/current.txt

@@ -7275,6 +7275,7 @@ package android.app {
   public final class UiAutomation {
     method public void adoptShellPermissionIdentity();
     method public void adoptShellPermissionIdentity(@Nullable java.lang.String...);
+    method public boolean clearCache();
     method @Deprecated public void clearWindowAnimationFrameStats();
     method public boolean clearWindowContentFrameStats(int);
     method public void dropShellPermissionIdentity();

core/api/test-current.txt

@@ -448,6 +448,7 @@ package android.app {
     method @Deprecated public boolean grantRuntimePermission(String, String, android.os.UserHandle);
     method public boolean injectInputEvent(@NonNull android.view.InputEvent, boolean, boolean);
     method public void injectInputEventToInputFilter(@NonNull android.view.InputEvent);
+    method public boolean isNodeInCache(@NonNull android.view.accessibility.AccessibilityNodeInfo);
     method @Deprecated public boolean revokeRuntimePermission(String, String, android.os.UserHandle);
     method public void syncInputTransactions();
     method public void syncInputTransactions(boolean);

core/java/android/app/UiAutomation.java

@@ -17,6 +17,7 @@
 package android.app;
 
 import android.accessibilityservice.AccessibilityGestureEvent;
+import android.accessibilityservice.AccessibilityService;
 import android.accessibilityservice.AccessibilityService.Callbacks;
 import android.accessibilityservice.AccessibilityService.IAccessibilityServiceClientWrapper;
 import android.accessibilityservice.AccessibilityServiceInfo;
@@ -58,6 +59,7 @@ import android.view.ViewRootImpl;
 import android.view.Window;
 import android.view.WindowAnimationFrameStats;
 import android.view.WindowContentFrameStats;
+import android.view.accessibility.AccessibilityCache;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityInteractionClient;
 import android.view.accessibility.AccessibilityNodeInfo;
@@ -464,6 +466,48 @@ public final class UiAutomation {
         mIsDestroyed = true;
     }
 
+    /**
+     * Clears the accessibility cache.
+     *
+     * @return {@code true} if the cache was cleared
+     * @see AccessibilityService#clearCache()
+     */
+    public boolean clearCache() {
+        final int connectionId;
+        synchronized (mLock) {
+            throwIfNotConnectedLocked();
+            connectionId = mConnectionId;
+        }
+        final AccessibilityCache cache = AccessibilityInteractionClient.getCache(connectionId);
+        if (cache == null) {
+            return false;
+        }
+        cache.clear();
+        return true;
+    }
+
+    /**
+     * Checks if {@code node} is in the accessibility cache.
+     *
+     * @param node the node to check.
+     * @return {@code true} if {@code node} is in the cache.
+     * @hide
+     * @see AccessibilityService#isNodeInCache(AccessibilityNodeInfo)
+     */
+    @TestApi
+    public boolean isNodeInCache(@NonNull AccessibilityNodeInfo node) {
+        final int connectionId;
+        synchronized (mLock) {
+            throwIfNotConnectedLocked();
+            connectionId = mConnectionId;
+        }
+        final AccessibilityCache cache = AccessibilityInteractionClient.getCache(connectionId);
+        if (cache == null) {
+            return false;
+        }
+        return cache.isNodeInCache(node);
+    }
+
     /**
      * Adopt the permission identity of the shell UID for all permissions. This allows
      * you to call APIs protected permissions which normal apps cannot hold but are