[Media Controls] Prevent flicker when enter/exit fullscreen

third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp

Index: third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
diff --git a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
index 7bc6352bbc12a346c8795bbd5dd7cc055a514be4..2f32c0510fc28434d2ae7adb85c8c19b4a0dfffc 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
@@ -572,12 +572,14 @@ LayoutObject* MediaControlsImpl::ContainerLayoutObject() {
   return GetLayoutObject();
 }
 
-void MediaControlsImpl::Show() {
-  MakeOpaque();
+void MediaControlsImpl::MaybeShow() {
   panel_->SetIsWanted(true);
   panel_->SetIsDisplayed(true);
   if (overlay_play_button_)
     overlay_play_button_->UpdateDisplayType();
+  // Only make the controls visible if they won't get hidden by OnTimeUpdate.
+  if (MediaElement().paused() || !ShouldHideMediaControls())
+    MakeOpaque();
 }
 
 void MediaControlsImpl::Hide() {
@@ -911,8 +913,8 @@ void MediaControlsImpl::OnFocusIn() {
   if (!MediaElement().ShouldShowControls())
     return;
 
-  Show();
   ResetHideMediaControlsTimer();
+  MaybeShow();
 }
 
 void MediaControlsImpl::OnTimeUpdate() {