Added foundation for supporting unit tests in WindowManager

- Check for null where appropriate when using WM from a test
- Inject WindowManagerPolicy for test can have its own policy
- Added skeleton for WindowStateTests that will contain tests
for WindowState class.

Bug: 30060889
Change-Id: I0cd7d50c98de16c7412759401075c4bb48d13dfe
diff --git a/services/tests/servicestests/src/com/android/server/wm/TestIWindow.java b/services/tests/servicestests/src/com/android/server/wm/TestIWindow.java
new file mode 100644
index 0000000..1514e69
--- /dev/null
+++ b/services/tests/servicestests/src/com/android/server/wm/TestIWindow.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.server.wm;
+
+import com.android.internal.os.IResultReceiver;
+
+import android.content.res.Configuration;
+import android.graphics.Rect;
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+import android.os.RemoteException;
+import android.view.DragEvent;
+import android.view.IWindow;
+
+public class TestIWindow extends IWindow.Stub {
+    @Override
+    public void executeCommand(String command, String parameters,
+            ParcelFileDescriptor descriptor)
+            throws RemoteException {
+
+    }
+
+    @Override
+    public void resized(Rect frame, Rect overscanInsets, Rect contentInsets, Rect visibleInsets,
+            Rect stableInsets, Rect outsets, boolean reportDraw, Configuration newConfig,
+            Rect backDropFrame, boolean forceLayout, boolean alwaysConsumeNavBar)
+            throws RemoteException {
+
+    }
+
+    @Override
+    public void moved(int newX, int newY) throws RemoteException {
+
+    }
+
+    @Override
+    public void dispatchAppVisibility(boolean visible) throws RemoteException {
+
+    }
+
+    @Override
+    public void dispatchGetNewSurface() throws RemoteException {
+
+    }
+
+    @Override
+    public void windowFocusChanged(boolean hasFocus, boolean inTouchMode)
+            throws RemoteException {
+
+    }
+
+    @Override
+    public void closeSystemDialogs(String reason) throws RemoteException {
+
+    }
+
+    @Override
+    public void dispatchWallpaperOffsets(float x, float y, float xStep, float yStep,
+            boolean sync)
+            throws RemoteException {
+
+    }
+
+    @Override
+    public void dispatchWallpaperCommand(String action, int x, int y, int z, Bundle extras,
+            boolean sync) throws RemoteException {
+
+    }
+
+    @Override
+    public void dispatchDragEvent(DragEvent event) throws RemoteException {
+
+    }
+
+    @Override
+    public void updatePointerIcon(float x, float y) throws RemoteException {
+
+    }
+
+    @Override
+    public void dispatchSystemUiVisibilityChanged(int seq, int globalVisibility, int localValue,
+            int localChanges) throws RemoteException {
+
+    }
+
+    @Override
+    public void dispatchWindowShown() throws RemoteException {
+
+    }
+
+    @Override
+    public void requestAppKeyboardShortcuts(IResultReceiver receiver, int deviceId)
+            throws RemoteException {
+
+    }
+}