Decouple MediaSession/MediaSessionObserver from WebContents in Java[OBSOLETE, go to the combined CL]

content/browser/media/session/media_session_impl.cc

Index: content/browser/media/session/media_session_impl.cc
diff --git a/content/browser/media/session/media_session_impl.cc b/content/browser/media/session/media_session_impl.cc
index 6ef85191c9f0d21a8bec2582a1a4aaa8d6d81fac..c19b212baa26ba5cc787e14f988fe72a4be78b3b 100644
--- a/content/browser/media/session/media_session_impl.cc
+++ b/content/browser/media/session/media_session_impl.cc
@@ -11,6 +11,11 @@
 #include "content/public/browser/web_contents_delegate.h"
 #include "media/base/media_content_type.h"
 
+#if defined(OS_ANDROID)
+#include "content/browser/media/session/media_session_android.h"
+#include "jni/MediaSession_jni.h"
+#endif  // defined(OS_ANDROID)
+
 namespace content {
 
 namespace {
@@ -59,6 +64,24 @@ MediaSessionImpl* MediaSessionImpl::Get(WebContents* web_contents) {
   return session;
 }
 
+#if defined(OS_ANDROID)
+bool RegisterMediaSessionNatives(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+// static
+base::android::ScopedJavaLocalRef<jobject> GetMediaSessionFromWebContents(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jclass>& clazz,
+    const base::android::JavaParamRef<jobject>& j_contents_android) {
+  WebContents* contents = WebContents::FromJavaWebContents(j_contents_android);
+  DCHECK(contents);
+  MediaSessionImpl* session = MediaSessionImpl::Get(contents);
+  return session->session_android()->GetJavaObject();
+}
+
+#endif  // defined(OS_ANDROID)
+
 MediaSessionImpl::~MediaSessionImpl() {
   DCHECK(players_.empty());
   DCHECK(audio_focus_state_ == State::INACTIVE);
@@ -93,8 +116,6 @@ void MediaSessionImpl::RemoveObserver(MediaSessionObserver* observer) {
 void MediaSessionImpl::SetMetadata(
     const base::Optional<MediaMetadata>& metadata) {
   metadata_ = metadata;
-  static_cast<WebContentsImpl*>(web_contents())
-      ->OnMediaSessionMetadataChanged();
   for (auto& observer : observers_)
     observer.MediaSessionMetadataChanged(metadata);
 }
@@ -400,7 +421,11 @@ MediaSessionImpl::MediaSessionImpl(WebContents* web_contents)
       audio_focus_state_(State::INACTIVE),
       audio_focus_type_(
           AudioFocusManager::AudioFocusType::GainTransientMayDuck),
-      is_ducking_(false) {}
+      is_ducking_(false) {
+#if defined(OS_ANDROID)
+  session_android_.reset(new MediaSessionAndroid(this));
+#endif  // defined(OS_ANDROID)
+}
 
 void MediaSessionImpl::Initialize() {
   delegate_ = AudioFocusDelegate::Create(this);
@@ -431,7 +456,6 @@ void MediaSessionImpl::AbandonSystemAudioFocusIfNeeded() {
 
 void MediaSessionImpl::UpdateWebContents() {
   media_session_state_listeners_.Notify(audio_focus_state_);
-  static_cast<WebContentsImpl*>(web_contents())->OnMediaSessionStateChanged();
   for (auto& observer : observers_)
     observer.MediaSessionStateChanged(IsControllable(), IsSuspended());
 }