[Android] A prototype of the interactive media notification.

content/browser/media/android/media_session.h

Index: content/browser/media/android/media_session.h
diff --git a/content/browser/media/android/media_session.h b/content/browser/media/android/media_session.h
index f36bb4ef13d79f35abbb55269d149ea10be349a9..3d7f83eba362966f90583d3e3e40675eecb4e827 100644
--- a/content/browser/media/android/media_session.h
+++ b/content/browser/media/android/media_session.h
@@ -10,12 +10,15 @@
 #include "base/android/scoped_java_ref.h"
 #include "base/id_map.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/android/media_controls_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
-namespace content {
 
 class MediaSessionBrowserTest;
+
+namespace content {
+
 class MediaSessionObserver;
 
 // MediaSession manages the Android AudioFocus for a given WebContents. It is
@@ -29,8 +32,9 @@ class MediaSessionObserver;
 // case of Transient and Content audio focus are both requested.
 // Android system interaction occurs in the Java counterpart to this class.
 class CONTENT_EXPORT MediaSession
-    : public content::WebContentsObserver,
-      protected content::WebContentsUserData<MediaSession> {
+    : public WebContentsObserver,
+      public MediaControlsDelegate,
+      protected WebContentsUserData<MediaSession> {
  public:
   enum class Type {
     Content,
@@ -66,21 +70,24 @@ class CONTENT_EXPORT MediaSession
   // Called by Java through JNI.
   void OnResume(JNIEnv* env, jobject obj);
 
- protected:
-  friend class content::MediaSessionBrowserTest;
+ private:
+  friend class content::WebContentsUserData<MediaSession>;
+  friend class ::MediaSessionBrowserTest;
 
   // Resets the |j_media_session_| ref to prevent calling the Java backend
   // during content_browsertests.
   void ResetJavaRefForTest();
-
   bool IsActiveForTest() const;
   Type audio_focus_type_for_test() const;
+  void RemoveAllPlayersForTest();
 
   void OnSuspend(bool temporary);
   void OnResume();
 
- private:
-  friend class content::WebContentsUserData<MediaSession>;
+  // MediaControlsDelegate implementation.
+  void OnControlsPause() override;
+  void OnControlsResume() override;
+  bool IsPaused() override;
 
   enum class State {
     Active,
@@ -120,6 +127,12 @@ class CONTENT_EXPORT MediaSession
   // MediaSession if the audio focus really need to be abandoned.
   void AbandonSystemAudioFocusIfNeeded();
 
+  // Shows media controls if the type is right and WebContentsDelegate is set.
+  void ShowMediaControlsIfNeeded(Type type);
+
+  // Hides media controls if the type is right and WebContentsDelegate is set.
+  void HideMediaControlsIfNeeded(Type type);
+
   base::android::ScopedJavaGlobalRef<jobject> j_media_session_;
   PlayersMap players_;