[Blink>Media] Add heuristic for dominant video detection for Android

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index aec1ea699ee6effb6145b5264b8744a6cec21558..6784fd0bba2251b0a24927cd38ef3529dafc5d30 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -356,7 +356,6 @@ void WebMediaPlayerImpl::enteredFullscreen() {
   }
   if (observer_)
     observer_->OnEnteredFullscreen();
-  delegate_->SetIsEffectivelyFullscreen(delegate_id_, true);
 }
 
 void WebMediaPlayerImpl::exitedFullscreen() {
@@ -366,7 +365,6 @@ void WebMediaPlayerImpl::exitedFullscreen() {
     DisableOverlay();
   if (observer_)
     observer_->OnExitedFullscreen();
-  delegate_->SetIsEffectivelyFullscreen(delegate_id_, false);
 }
 
 void WebMediaPlayerImpl::becameDominantVisibleContent(bool isDominant) {
@@ -374,6 +372,11 @@ void WebMediaPlayerImpl::becameDominantVisibleContent(bool isDominant) {
     observer_->OnBecameDominantVisibleContent(isDominant);
 }
 
+void WebMediaPlayerImpl::setIsEffectivelyFullscreen(
+    bool isEffectivelyFullscreen) {
+  delegate_->SetIsEffectivelyFullscreen(delegate_id_, isEffectivelyFullscreen);
+}
+
 void WebMediaPlayerImpl::DoLoad(LoadType load_type,
                                 const blink::WebURL& url,
                                 CORSMode cors_mode) {