Rename GrAccelData to SkLayerInfo and move it to src/core

src/core/SkLayerInfo.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-#include "GrPictureUtils.h"
+#include "SkLayerInfo.h"
 
-#include "SkBBoxHierarchy.h"
-#include "SkPaintPriv.h"
-#include "SkPatchUtils.h"
-#include "SkRecord.h"
-#include "SkRecords.h"
-
-SkPicture::AccelData::Key GrAccelData::ComputeAccelDataKey() {
+SkPicture::AccelData::Key SkLayerInfo::ComputeKey() {
     static const SkPicture::AccelData::Key gGPUID = SkPicture::AccelData::GenerateDomain();
 
     return gGPUID;
 }