Make UiAutomation#takeScreenshot(Window) public

This API is useful when trying to take a screenshot of a window instead
of the entire display. It allows the screenshot to ignore anything else
on screen, except the specified window.

Test: ASurfaceControlTestActivity
Fixes: 237681925
Change-Id: Idc08af39645f572ead4fc191d7f26970813241e2

core/api/current.txt

@@ -7050,6 +7050,7 @@ package android.app {
     method public void setRunAsMonkey(boolean);
     method public void setServiceInfo(android.accessibilityservice.AccessibilityServiceInfo);
     method public android.graphics.Bitmap takeScreenshot();
+    method @Nullable public android.graphics.Bitmap takeScreenshot(@NonNull android.view.Window);
     method public void waitForIdle(long, long) throws java.util.concurrent.TimeoutException;
     field public static final int FLAG_DONT_SUPPRESS_ACCESSIBILITY_SERVICES = 1; // 0x1
     field public static final int FLAG_DONT_USE_ACCESSIBILITY = 2; // 0x2

core/api/test-current.txt

@@ -438,7 +438,6 @@ package android.app {
     method @Deprecated public boolean revokeRuntimePermission(String, String, android.os.UserHandle);
     method public void syncInputTransactions();
     method public void syncInputTransactions(boolean);
-    method @Nullable public android.graphics.Bitmap takeScreenshot(@NonNull android.view.Window);
     field @NonNull public static final java.util.Set<java.lang.String> ALL_PERMISSIONS;
   }
 

core/java/android/app/UiAutomation.java

@@ -1068,10 +1068,7 @@ public final class UiAutomation {
      * @param window Window to take a screenshot of
      *
      * @return The screenshot bitmap on success, null otherwise.
-     *
-     * @hide
      */
-    @TestApi
     @Nullable
     public Bitmap takeScreenshot(@NonNull Window window) {
         if (window == null) {