[Chromecast] Turn CastContentWindow into an abstract interface.

chromecast/browser/android/cast_content_window_android.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_CONTENT_WINDOW_ANDROID_H_
+#define CHROMECAST_BROWSER_ANDROID_CAST_CONTENT_WINDOW_ANDROID_H_
+
+#include <jni.h>
+
+#include <memory>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "chromecast/browser/cast_content_window.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+class BrowserContext;
+class WebContents;
+}
+
+namespace chromecast {
+namespace shell {
+
+// Android implementation of CastContentWindow, which displays WebContents in
+// CastWebContentsActivity.
+class CastContentWindowAndroid : public CastContentWindow,
+                                 public content::WebContentsObserver {
+ public:
+  static bool RegisterJni(JNIEnv* env);
+
+  ~CastContentWindowAndroid() override;
+
+  // CastContentWindow implementation:
+  void SetTransparent() override;
+  void ShowWebContents(content::WebContents* web_contents) override;
+  std::unique_ptr<content::WebContents> CreateWebContents(
+      content::BrowserContext* browser_context) override;
+
+  // content::WebContentsObserver implementation:
+  void DidFirstVisuallyNonEmptyPaint() override;
+  void MediaStartedPlaying(const MediaPlayerInfo& media_info,
+                           const MediaPlayerId& id) override;
+  void MediaStoppedPlaying(const MediaPlayerInfo& media_info,
+                           const MediaPlayerId& id) override;
+  void RenderViewCreated(content::RenderViewHost* render_view_host) override;
+
+  // Called through JNI.
+  void OnActivityStopped(JNIEnv* env,
+                         const base::android::JavaParamRef<jobject>& jcaller);
+  void OnKeyDown(JNIEnv* env,
+                 const base::android::JavaParamRef<jobject>& jcaller,
+                 int keycode);
+
+ private:
+  friend class CastContentWindow;
+
+  // This class should only be instantiated by CastContentWindow::Create.
+  explicit CastContentWindowAndroid(CastContentWindow::Delegate* delegate);
+
+  CastContentWindow::Delegate* const delegate_;
+  bool transparent_;
+  base::android::ScopedJavaGlobalRef<jobject> java_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastContentWindowAndroid);
+};
+
+}  // namespace shell
+}  // namespace chromecast
+
+#endif  // CHROMECAST_BROWSER_ANDROID_CAST_CONTENT_WINDOW_ANDROID_H_