[Android] Refactor NativeView to be able to use it for AutofillDialog.

ui/android/view_android.cc

+// Copyright (c) 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/view_android.h"
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_helper.h"
+#include "base/android/scoped_java_ref.h"
+#include "jni/ViewAndroid_jni.h"
+#include "ui/android/window_android.h"
+
+namespace ui {
+
+using base::android::AttachCurrentThread;
+using base::android::ScopedJavaLocalRef;
+
+ViewAndroid::ViewAndroid(JNIEnv* env, jobject obj, WindowAndroid* window)
+  : weak_java_view_(env, obj),
+    window_android_(window) {}
+
+void ViewAndroid::Destroy(JNIEnv* env, jobject obj) {
+  DCHECK(obj && env->IsSameObject(weak_java_view_.get(env).obj(), obj));
+  delete this;
+}
+
+ScopedJavaLocalRef<jobject> ViewAndroid::GetJavaObject() {
+  // It is mandatory to explicitly call destroy() before releasing the java
+  // side object. This could be changed in future by adding CleanupReference
+  // based destruct path;
+  return weak_java_view_.get(AttachCurrentThread());
+}
+
+WindowAndroid* ViewAndroid::GetWindowAndroid() {
+  return window_android_;
+}
+
+bool ViewAndroid::RegisterViewAndroid(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+ViewAndroid::~ViewAndroid() {
+}
+
+jint Init(JNIEnv* env, jobject obj, jint window) {
+  ViewAndroid* view = new ViewAndroid(
+      env, obj, reinterpret_cast<ui::WindowAndroid*>(window));
+  return reinterpret_cast<jint>(view);
+}
+
+}  // namespace ui