Only use 256x256 tiles on hd2000 nanobench bots

bench/SKPBench.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 "SKPBench.h"
 #include "SkCommandLineFlags.h"
 #include "SkMultiPictureDraw.h"
 #include "SkSurface.h"
 
-DEFINE_int32(benchTileW, 256, "Tile width  used for SKP playback.");
-DEFINE_int32(benchTileH, 256, "Tile height used for SKP playback.");
+DEFINE_int32(benchTileW, 1600, "Tile width  used for SKP playback.");
+DEFINE_int32(benchTileH, 512, "Tile height used for SKP playback.");
 
 SKPBench::SKPBench(const char* name, const SkPicture* pic, const SkIRect& clip, SkScalar scale,
                    bool useMultiPictureDraw)
     : fPic(SkRef(pic))
     , fClip(clip)
     , fScale(scale)
     , fName(name)
     , fUseMultiPictureDraw(useMultiPictureDraw) {
     fUniqueName.printf("%s_%.2g", name, scale);  // Scale makes this unqiue for perf.skia.org traces.
     if (useMultiPictureDraw) {
@@ skipping 96 matching lines @@
                                    -fTileRects[j].fTop / fScale);
                 fSurfaces[j]->getCanvas()->drawPicture(fPic, &trans, NULL);
             }
 
             for (int j = 0; j < fTileRects.count(); ++j) {
                 fSurfaces[j]->getCanvas()->flush();
             }
         }
     }
 }