Revert of Don't use webmediaplayer to inform webview about fullscreen change...

Revert of Don't use webmediaplayer to inform webview about fullscreen change (https://codereview.chromium.org/275163002/)

Reason for revert:
this will break webview due to poor support of fullscreen api

Original issue's description:
> Don't use webmediaplayer to inform webview about fullscreen change
> 
> Currently we rely on webmediaplayer to inform webview about fullscreen change.
> With https://codereview.chromium.org/277823002/, we no longer need to do so.
> When entering fullscreen, the page will be resized to fullscreen, and that will call Will/DidEnterFullscreen for us.
> When leaving the fullscreen, ToggleFullscreenForTab() will request the tab to exit fullscreen. That should trigger the Resize() call and send Will/DidExitFullscreen for us.
> 
> BUG=367346
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=270005

TBR=trchen@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=367346

Review URL: https://codereview.chromium.org/281803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270141 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/media/android/browser_media_player_manager.cc

@@ -199,10 +199,10 @@ void BrowserMediaPlayerManager::FullscreenPlayerSeek(int msec) {
 }
 
 void BrowserMediaPlayerManager::ExitFullscreen(bool release_media_player) {
-  if (WebContentsDelegate* delegate = web_contents_->GetDelegate())
-    delegate->ToggleFullscreenModeForTab(web_contents_, false);
   if (!CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableOverlayFullscreenVideoSubtitle)) {
+    if (WebContentsDelegate* delegate = web_contents_->GetDelegate())
+      delegate->ToggleFullscreenModeForTab(web_contents_, false);
     if (RenderWidgetHostViewAndroid* view_android =
         static_cast<RenderWidgetHostViewAndroid*>(
             web_contents_->GetRenderWidgetHostView())) {
@@ -251,6 +251,8 @@ void BrowserMediaPlayerManager::SetVideoSurface(
           web_contents_->GetRenderWidgetHostView())) {
     view_android->SetOverlayVideoMode(true);
   }
+  if (WebContentsDelegate* delegate = web_contents_->GetDelegate())
+    delegate->ToggleFullscreenModeForTab(web_contents_, true);
 }
 
 void BrowserMediaPlayerManager::OnMediaMetadataChanged(

content/renderer/media/android/webmediaplayer_android.cc

@@ -762,6 +762,8 @@ void WebMediaPlayerAndroid::OnDisconnectedFromRemoteDevice() {
 
 void WebMediaPlayerAndroid::OnDidEnterFullscreen() {
   if (!manager_->IsInFullscreen(frame_)) {
+    frame_->view()->willEnterFullScreen();
+    frame_->view()->didEnterFullScreen();
     manager_->DidEnterFullscreen(frame_);
   }
 }
@@ -780,6 +782,8 @@ void WebMediaPlayerAndroid::OnDidExitFullscreen() {
     manager_->RequestExternalSurface(player_id_, last_computed_rect_);
 #endif  // defined(VIDEO_HOLE)
 
+  frame_->view()->willExitFullScreen();
+  frame_->view()->didExitFullScreen();
   manager_->DidExitFullscreen();
   client_->repaint();
 }