AndroidOverlay implementation using Dialog.

content/browser/android/dialog_overlay_impl.h

+// Copyright 2017 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.
+
+#ifndef CONTENT_BROWSER_ANDROID_DIALOG_OVERLAY_IMPL_H_
+#define CONTENT_BROWSER_ANDROID_DIALOG_OVERLAY_IMPL_H_
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/unguessable_token.h"
+#include "content/browser/android/content_view_core_impl.h"
+#include "content/browser/android/content_view_core_impl_observer.h"
+
+namespace content {
+
+// Native counterpart to DialogOverlayImpl java class.  This is created by the
+// java side.  When the ContentViewCore for the provided token is attached or
+// detached from a WindowAndroid, we get the Android window token and notify the
+// java side.
+class DialogOverlayImpl : public ContentViewCoreImplObserver {
+ public:
+  // Registers the JNI methods for DialogOverlayImpl.
+  static bool RegisterDialogOverlayImpl(JNIEnv* env);
+
+  DialogOverlayImpl(const base::android::JavaParamRef<jobject>& obj,
+                    const base::UnguessableToken& token);
+  ~DialogOverlayImpl() override;
+
+  // Clean up and post to delete |this| later.
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
+
+  // ContentViewCoreImplObserver
+  void OnContentViewCoreDestroyed() override;
+  void OnAttachedToWindow() override;
+  void OnDetachedFromWindow() override;
+
+  // Unregister for tokens if we're registered, and clear |cvc_|.
+  void UnregisterForTokensIfNeeded();
+
+ private:
+  // Look up the ContentViewCore for |renderer_pid_| and |render_frame_id_|.
+  ContentViewCoreImpl* GetContentViewCore();
+
+  // Java object that owns us.
+  JavaObjectWeakGlobalRef obj_;
+
+  base::UnguessableToken token_;
+
+  // ContentViewCoreImpl instance that we're registered with as an observer.
+  ContentViewCoreImpl* cvc_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_DIALOG_OVERLAY_IMPL_H_