Use size compat bounds for window layout

When an app is in size compat mode, the configuration bounds
and layout bounds are not the same such as the app keeps
a larger configuration bounds and needs to be scaled when
drawing on screen. The size compat bounds are the scaled
bounds in screen coordinates so it should be used if available.

Fix: 194820928
Test: SizeCompatTests#testFixedScreenBoundsWhenDisplaySizeChanged
Change-Id: Ib97038560e65699f5275d6f5dc4b8e5881024e57

services/core/java/com/android/server/wm/WindowState.java

@@ -1441,6 +1441,14 @@ class WindowState extends WindowContainer<WindowState> implements WindowManagerP
         }
     }
 
+    @Override
+    public Rect getBounds() {
+        // The window bounds are used for layout in screen coordinates. If the token has bounds for
+        // size compatibility mode, its configuration bounds are app based coordinates which should
+        // not be used for layout.
+        return mToken.hasSizeCompatBounds() ? mToken.getBounds() : super.getBounds();
+    }
+
     /** Retrieves the current frame of the window that the application sees. */
     Rect getFrame() {
         return mWindowFrames.mFrame;

services/tests/wmtests/src/com/android/server/wm/SizeCompatTests.java

@@ -320,6 +320,11 @@ public class SizeCompatTests extends WindowTestsBase {
         assertScaled();
         // Activity is sandboxed due to size compat mode.
         assertActivityMaxBoundsSandboxed();
+
+        final WindowState appWindow = addWindowToActivity(mActivity);
+        assertTrue(mActivity.hasSizeCompatBounds());
+        assertEquals("App window must use size compat bounds for layout in screen space",
+                mActivity.getBounds(), appWindow.getBounds());
     }
 
     @Test