Qualify the generated includes in core (partial).

Source/core/animation/Keyframe.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef Keyframe_h
 #define Keyframe_h
 
-#include "CSSPropertyNames.h"
+#include "core/CSSPropertyNames.h"
 #include "core/animation/AnimatableValue.h"
 #include "core/animation/AnimationEffect.h"
 #include "core/animation/AnimationNode.h"
 
 namespace WebCore {
 
 typedef HashSet<CSSPropertyID> PropertySet;
 
 class Element;
 
@@ skipping 74 matching lines @@
     }
 
     double m_offset;
     AnimationEffect::CompositeOperation m_composite;
     RefPtr<TimingFunction> m_easing;
 };
 
 }
 
 #endif