add new readPixels with direct memory parameters

src/utils/SkPictureUtils.cpp

 /*
  * Copyright 2012 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 "SkCanvas.h"
 #include "SkData.h"
@@ skipping 146 matching lines @@
                               const uint16_t indices[], int indexCount,
                               const SkPaint& paint) SK_OVERRIDE {
         this->addBitmapFromPaint(paint);
     }
     virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
                             const SkPaint&) SK_OVERRIDE {
         nothing_to_do();
     }
 
 protected:
-    virtual bool onReadPixels(const SkBitmap& bitmap,
-                              int x, int y,
-                              SkCanvas::Config8888 config8888) SK_OVERRIDE {
-        not_supported();
-        return false;
-    }
-
     virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
         not_supported();
     }
     virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info, Usage usage) SK_OVERRIDE {
         // we expect to only get called via savelayer, in which case it is fine.
         SkASSERT(kSaveLayer_Usage == usage);
         return SkNEW_ARGS(GatherPixelRefDevice, (info.width(), info.height(), fPRSet));
     }
     virtual void flush() SK_OVERRIDE {}
 
@@ skipping 44 matching lines @@
     canvas.clipRect(area, SkRegion::kIntersect_Op, false);
     canvas.drawPicture(*pict);
 
     SkData* data = NULL;
     int count = array.count();
     if (count > 0) {
         data = SkData::NewFromMalloc(array.detach(), count * sizeof(SkPixelRef*));
     }
     return data;
 }