Fix cpplint errors in cc/(animation|input|layers|trees|test)/

cc/layers/io_surface_layer_impl.h

 // Copyright 2012 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 CC_LAYERS_IO_SURFACE_LAYER_IMPL_H_
 #define CC_LAYERS_IO_SURFACE_LAYER_IMPL_H_
 
+#include <string>
+
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer_impl.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 
 class CC_EXPORT IOSurfaceLayerImpl : public LayerImpl {
  public:
   static scoped_ptr<IOSurfaceLayerImpl> Create(LayerTreeImpl* tree_impl,
                                                int id) {
@@ skipping 24 matching lines @@
   gfx::Size io_surface_size_;
   bool io_surface_changed_;
   unsigned io_surface_texture_id_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSurfaceLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_IO_SURFACE_LAYER_IMPL_H_