Rework MediaQueryMatcher to batch up listener notification

Source/core/css/MediaQueryListListener.cpp

Index: Source/core/css/MediaQueryListListener.cpp
diff --git a/Source/core/css/MediaQueryListListener.cpp b/Source/core/css/MediaQueryListListener.cpp
index 494883e7ed8d262024155d64bf7e25d5d867b315..8467e76890281534a9b769ba53da487158887258 100644
--- a/Source/core/css/MediaQueryListListener.cpp
+++ b/Source/core/css/MediaQueryListListener.cpp
@@ -25,8 +25,11 @@
 
 namespace WebCore {
 
-void MediaQueryListListener::queryChanged(ScriptState* state, MediaQueryList* query)
+void MediaQueryListListener::call(ScriptState* state)
 {
+    if (!m_query)
+        return;
+
     ScriptCallback callback(state, m_value);
     v8::HandleScope handleScope(state->isolate());
 
@@ -35,7 +38,7 @@ void MediaQueryListListener::queryChanged(ScriptState* state, MediaQueryList* qu
         return; // JS may not be enabled.
 
     v8::Context::Scope scope(context);
-    callback.appendArgument(ScriptValue(toV8(query, v8::Handle<v8::Object>(), context->GetIsolate()), context->GetIsolate()));
+    callback.appendArgument(ScriptValue(toV8(m_query.get(), v8::Handle<v8::Object>(), context->GetIsolate()), context->GetIsolate()));
     callback.call();
 }