Make WindowAndroid a ViewAndroid

ui/android/window_android.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/android/window_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
@@ skipping 19 matching lines @@
 
 ScopedJavaLocalRef<jobject> WindowAndroid::GetJavaObject() {
   return base::android::ScopedJavaLocalRef<jobject>(java_window_);
 }
 
 bool WindowAndroid::RegisterWindowAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 WindowAndroid::~WindowAndroid() {
+  DCHECK(parent_ == nullptr) << "WindowAndroid must be a root view.";
   DCHECK(!compositor_);
 }
 
 WindowAndroid* WindowAndroid::createForTesting() {
   JNIEnv* env = AttachCurrentThread();
   jobject context = base::android::GetApplicationContext();
   return new WindowAndroid(
       env, Java_WindowAndroid_createForTesting(env, context).obj());
 }
 
@@ skipping 96 matching lines @@
 void WindowAndroid::StartDragAndDrop(
     const JavaRef<jobject>& jview_android_delegate,
     const JavaRef<jstring>& jtext,
     const JavaRef<jobject>& jimage) {
   JNIEnv* env = AttachCurrentThread();
   Java_WindowAndroid_startDragAndDrop(env, GetJavaObject().obj(),
                                       jview_android_delegate.obj(), jtext.obj(),
                                       jimage.obj());
 }
 
+WindowAndroid* WindowAndroid::GetWindowAndroid() const {
+  DCHECK(parent_ == nullptr);
+  return const_cast<WindowAndroid*>(this);
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
 jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   WindowAndroid* window = new WindowAndroid(env, obj);
   return reinterpret_cast<intptr_t>(window);
 }
 
 }  // namespace ui