Use correct APIs to detect conditions for round scrollbars.

Bug: 34876394

Test: Performed manually.

Change-Id: I9e690e99fd8d925c589ebd19d9c6754eeb63b1d8

core/java/android/view/View.java

@@ -23910,7 +23910,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      * Determine if this view is rendered on a round wearable device and is the main view
      * on the screen.
      */
-    private boolean shouldDrawRoundScrollbar() {
+    boolean shouldDrawRoundScrollbar() {
         if (!mResources.getConfiguration().isScreenRound() || mAttachInfo == null) {
             return false;
         }
@@ -23927,7 +23927,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
             return false;
         }
 
-        getLocationOnScreen(mAttachInfo.mTmpLocation);
+        getLocationInWindow(mAttachInfo.mTmpLocation);
         return mAttachInfo.mTmpLocation[0] == insets.getStableInsetLeft()
                 && mAttachInfo.mTmpLocation[1] == insets.getStableInsetTop();
     }

core/tests/coretests/src/android/view/ViewAttachTest.java

@@ -16,9 +16,17 @@
 
 package android.view;
 
+import android.content.Context;
 import android.content.pm.ActivityInfo;
+import android.graphics.PixelFormat;
 import android.os.SystemClock;
 import android.test.ActivityInstrumentationTestCase2;
+import android.test.UiThreadTest;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+
+import com.android.frameworks.coretests.R;
 
 public class ViewAttachTest extends
         ActivityInstrumentationTestCase2<ViewAttachTestActivity> {
@@ -51,4 +59,38 @@ public class ViewAttachTest extends
             SystemClock.sleep(250);
         }
     }
+
+    /**
+     * Make sure that on any attached view, if the view is full-screen and hosted
+     * on a round device, the round scrollbars will be displayed even if the activity
+     * window is offset.
+     *
+     * @throws Throwable
+     */
+    @UiThreadTest
+    public void testRoundScrollbars() throws Throwable {
+        final ViewAttachTestActivity activity = getActivity();
+        final View rootView = activity.getWindow().getDecorView();
+        final WindowManager.LayoutParams params =
+            new WindowManager.LayoutParams(
+                rootView.getWidth(),
+                rootView.getHeight(),
+                50, /* xPosition */
+                0, /* yPosition */
+                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
+                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
+                PixelFormat.TRANSLUCENT);
+
+        rootView.setLayoutParams(params);
+
+        View contentView = activity.findViewById(R.id.view_attach_view);
+        boolean shouldDrawRoundScrollbars = contentView.shouldDrawRoundScrollbar();
+
+        if (activity.getResources().getConfiguration().isScreenRound()) {
+            assertTrue(shouldDrawRoundScrollbars);
+        } else {
+            // Never draw round scrollbars on non-round devices.
+            assertFalse(shouldDrawRoundScrollbars);
+        }
+    }
 }