Call media query change listeners asynchronously.

Source/core/css/MediaQueryMatcher.cpp

Index: Source/core/css/MediaQueryMatcher.cpp
diff --git a/Source/core/css/MediaQueryMatcher.cpp b/Source/core/css/MediaQueryMatcher.cpp
index c9e748ea306699aa06658f8c756d77aa2e86f90d..89bcf843511b67512dab75de90e07624f28a17f5 100644
--- a/Source/core/css/MediaQueryMatcher.cpp
+++ b/Source/core/css/MediaQueryMatcher.cpp
@@ -26,6 +26,7 @@
 #include "core/css/MediaQueryListListener.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
+#include "core/dom/ScriptedAnimationController.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 
@@ -105,18 +106,29 @@ void MediaQueryMatcher::mediaFeaturesChanged()
     if (!m_document)
         return;
 
-    WillBeHeapVector<RefPtrWillBeMember<MediaQueryListListener> > listenersToNotify;
+    WillBeHeapVector<RefPtrWillBeMember<MediaQueryList::Listener> > listenersToNotify;
     for (MediaQueryListSet::iterator it = m_mediaLists.begin(); it != m_mediaLists.end(); ++it)
         (*it)->mediaFeaturesChanged(&listenersToNotify);
 
-    // FIXME: This should be async! We're running script inside ::layout() or ::updateRenderTree().
     for (size_t i = 0; i < listenersToNotify.size(); ++i)
-        listenersToNotify[i]->call();
+        m_delayedListeners.append(listenersToNotify[i]);
+
+    m_document->ensureScriptedAnimationController().scheduleAnimationIfNeeded();

[esprehn, 2014/07/01 00:01:06]

scheduleAnimationIfNeeded() should be private, I think you want
scheduleVisualUpdate().

[cbiesinger, 2014/07/01 00:12:09]

On PageAnimator? Hm... I'm not positive but I don't believe that will call
ensureScriptedAnimationController(), but that does need to be called.

+}
+
+void MediaQueryMatcher::notifyDelayedListeners()
+{
+    WillBeHeapVector<RefPtrWillBeMember<MediaQueryList::Listener> > listeners;
+    listeners.swap(m_delayedListeners);
+
+    for (size_t i = 0; i < listeners.size(); ++i)
+        listeners[i]->mediaQueryChanged();
 }
 
 void MediaQueryMatcher::trace(Visitor* visitor)
 {
     visitor->trace(m_document);
+    visitor->trace(m_delayedListeners);
     visitor->trace(m_mediaLists);
 }