Implement support for a Context parameter in image filters

src/core/SkBitmapDevice.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkConfig8888.h"
 #include "SkDraw.h"
@@ skipping 146 matching lines @@
 
 const SkBitmap& SkBitmapDevice::onAccessBitmap() {
     return fBitmap;
 }
 
 bool SkBitmapDevice::canHandleImageFilter(const SkImageFilter*) {
     return false;
 }
 
 bool SkBitmapDevice::filterImage(const SkImageFilter* filter, const SkBitmap& src,
-                                 const SkMatrix& ctm, SkBitmap* result,
+                                 const SkImageFilter::Context& ctx, SkBitmap* result,
                                  SkIPoint* offset) {
     return false;
 }
 
 bool SkBitmapDevice::allowImageFilter(const SkImageFilter*) {
     return true;
 }
 
 bool SkBitmapDevice::onReadPixels(const SkBitmap& bitmap,
                                   int x, int y,
@@ skipping 397 matching lines @@
         paint.getStyle() != SkPaint::kFill_Style ||
         !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode)) {
         // turn off lcd
         flags->fFlags = paint.getFlags() & ~SkPaint::kLCDRenderText_Flag;
         flags->fHinting = paint.getHinting();
         return true;
     }
     // we're cool with the paint as is
     return false;
 }