Simplify media query handling for stylesheets.

sky/engine/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 204 matching lines @@
     TemporaryChange<bool> changeSchedulingEnabled(m_layoutSchedulingEnabled, false);
 
     if (!m_nestedLayoutCount && !m_inSynchronousPostLayout && m_postLayoutTasksTimer.isActive()) {
         // This is a new top-level layout. If there are any remaining tasks from the previous layout, finish them now.
         m_inSynchronousPostLayout = true;
         performPostLayoutTasks();
         m_inSynchronousPostLayout = false;
     }
 
     Document* document = m_frame->document();
-    if (wasViewportResized())
+    if (wasViewportResized()) {
         document->notifyResizeForViewportUnits();
+        document->mediaQueryAffectingValueChanged();
 
-    // Viewport-dependent media queries may cause us to need completely different style information.
-    if (document->styleResolver().mediaQueryAffectedByViewportChange()) {
+        // TODO(esprehn): This is way too much work, it rebuilds the entire sheet list
+        // and does a full document recalc.
         document->styleResolverChanged();
-        document->mediaQueryAffectingValueChanged();
-    } else {
-        document->evaluateMediaQueryList();
     }
 
     document->updateRenderTreeIfNeeded();
     lifecycle().advanceTo(DocumentLifecycle::StyleClean);
 }
 
 void FrameView::performLayout(RenderObject* rootForThisLayout, bool inSubtreeLayout)
 {
     TRACE_EVENT0("blink", "FrameView::performLayout");
 
@@ skipping 653 matching lines @@
     totalObjects = 0;
 
     for (RenderObject* o = root; o; o = o->nextInPreOrder(root)) {
         ++totalObjects;
         if (o->needsLayout())
             ++needsLayoutObjects;
     }
 }
 
 } // namespace blink