AndroidOverlay implementation using Dialog.

content/browser/android/dialog_overlay_operations_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_OPERATIONS_IMPL_H_
+#define CONTENT_BROWSER_ANDROID_DIALOG_OVERLAY_OPERATIONS_IMPL_H_
+
+#include "base/android/jni_android.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 DialogOverlayOperationsImpl java class.  This is
+// created by the java class.  When the ContentViewCore for the provided token
+// is attached to or detached from a WindowAndroid, we get the Android window
+// token and notify the java class.
+class DialogOverlayOperationsImpl : public ContentViewCoreImplObserver {
+ public:
+  // Registers the JNI methods for DialogOverlayOperationsImpl.
+  static bool RegisterDialogOverlayOperationsImpl(JNIEnv* env);
+
+  DialogOverlayOperationsImpl(
+      const base::android::JavaParamRef<jobject>& receiver,
+      const base::UnguessableToken& token);
+
+  ~DialogOverlayOperationsImpl() override;
+
+  // 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();
+
+ private:
+  // Java object that owns us.
+  base::android::ScopedJavaGlobalRef<jobject> receiver_;
+
+  base::UnguessableToken token_;
+
+  // ContentViewCoreImpl instance that we're registered with as an observer.
+  ContentViewCoreImpl* cvc_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_DIALOG_OVERLAY_OPERATIONS_IMPL_H_