Media Controls: invalidate volume slider when value changes.

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

Index: third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
index ab7ea8ba8e3b49eb06eab6803c62fa301c017a3f..22fb23c994c4be23658f73e44880d9b9c80ace6e 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.cpp
@@ -856,8 +856,12 @@ bool MediaControlVolumeSliderElement::willRespondToMouseClickEvents() {
 }
 
 void MediaControlVolumeSliderElement::setVolume(double volume) {
-  if (value().toDouble() != volume)
-    setValue(String::number(volume));
+  if (value().toDouble() == volume)
+    return;
+
+  setValue(String::number(volume));
+  if (LayoutObject* layoutObject = this->layoutObject())
+    layoutObject->setShouldDoFullPaintInvalidation();
 }
 
 bool MediaControlVolumeSliderElement::keepEventInNode(Event* event) {