Media controls refer to less magic state.

third_party/WebKit/Source/core/html/shadow/MediaControls.cpp

Index: third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
index ab6d1484d6c2745d87b7cf773b5775d974c2d41b..4dafc7a627b8f385d7791687cfd92f8a73f50d97 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControls.cpp
@@ -414,8 +414,7 @@ void MediaControls::updateVolume()
 {
     m_muteButton->updateDisplayType();
     // Invalidate the mute button because it paints differently according to volume.
-    if (LayoutObject* layoutObject = m_muteButton->layoutObject())
-        layoutObject->setShouldDoFullPaintInvalidation();
+    repaint(m_muteButton);

[philipj_slow, 2015/10/28 15:14:02]

Maybe call it invalidate() to match the comment? I doesn't synchronously
repaint, after all. I guess it doesn't even synchronously invalidate, but that's
close enough for my taste :)

[liberato (no reviews please), 2015/10/29 16:10:26]

Done.  ... but it really does toggleVariousBits().  :)

 
     if (mediaElement().muted())
         m_volumeSlider->setVolume(0);
@@ -441,8 +440,7 @@ void MediaControls::updateVolume()
     }
 
     // Invalidate the volume slider because it paints differently according to volume.
-    if (LayoutObject* layoutObject = m_volumeSlider->layoutObject())
-        layoutObject->setShouldDoFullPaintInvalidation();
+    repaint(m_volumeSlider);
 }
 
 void MediaControls::changedClosedCaptionsVisibility()
@@ -708,6 +706,25 @@ void MediaControls::setAllowHiddenVolumeControls(bool allow)
     updateVolume();
 }
 
+void MediaControls::repaint(Element* element)
+{
+    if (!element)
+        return;
+
+    if (LayoutObject* layoutObject = element->layoutObject())
+        layoutObject->setShouldDoFullPaintInvalidation();
+}
+
+void MediaControls::networkStateChanged()
+{
+    repaint(m_playButton);
+    repaint(m_overlayPlayButton);
+    repaint(m_muteButton);
+    repaint(m_fullScreenButton);
+    repaint(m_timeline);
+    repaint(m_volumeSlider);
+}
+
 DEFINE_TRACE(MediaControls)
 {
     visitor->trace(m_mediaElement);