Introduce WindowContext API

Test: atest WmTests CtsWindowManagerDeviceTestCases
Bug: 128338354
Change-Id: I9c9dfc5e7f4edd4c968e60d2ffcbb19b5c72a853

test-mock/api/test-current.txt

@@ -2,7 +2,6 @@
 package android.test.mock {
 
   public class MockContext extends android.content.Context {
-    method public android.view.Display getDisplay();
     method public int getDisplayId();
   }
 

test-mock/src/android/test/mock/MockContext.java

@@ -17,6 +17,7 @@
 package android.test.mock;
 
 import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.annotation.SystemApi;
 import android.app.IApplicationThread;
 import android.app.IServiceConnection;
@@ -810,6 +811,11 @@ public class MockContext extends Context {
         throw new UnsupportedOperationException();
     }
 
+    @Override
+    public @NonNull Context createWindowContext(int type) {
+        throw new UnsupportedOperationException();
+    }
+
     @Override
     public boolean isRestricted() {
         throw new UnsupportedOperationException();
@@ -821,7 +827,6 @@ public class MockContext extends Context {
         throw new UnsupportedOperationException();
     }
 
-    /** @hide */
     @Override
     public Display getDisplay() {
         throw new UnsupportedOperationException();