[Chromecast] Turn CastContentWindow into an abstract interface.

chromecast/browser/android/cast_web_contents_activity.h

+// Copyright 2016 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 CHROMECAST_BROWSER_ANDROID_CAST_WEB_CONTENTS_ACTIVITY_H_
+#define CHROMECAST_BROWSER_ANDROID_CAST_WEB_CONTENTS_ACTIVITY_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "base/supports_user_data.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace chromecast {
+namespace shell {
+
+// Helper class to get members of the CastWebContentsActivity displaying a
+// given web_contents. This class is lazily created through the Get function and
+// will manage its own lifetime via SupportsUserData.
+class CastWebContentsActivity : base::SupportsUserData::Data {
+ public:
+  static bool RegisterJni(JNIEnv* env);
+  static CastWebContentsActivity* Get(content::WebContents* web_contents);
+
+  base::android::ScopedJavaLocalRef<jobject> GetContentVideoViewEmbedder();
+  void SetContentVideoViewEmbedder(
+      const base::android::JavaRef<jobject>& content_video_view_embedder);
+
+ private:
+  explicit CastWebContentsActivity(content::WebContents* web_contents);
+  ~CastWebContentsActivity() override;
+
+  base::android::ScopedJavaGlobalRef<jobject> content_video_view_embedder_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastWebContentsActivity);
+};
+
+}  // namespace shell
+}  // namespace chromecast
+
+#endif  // CHROMECAST_BROWSER_ANDROID_CAST_WEB_CONTENTS_ACTIVITY_H_