Add loopSKP flag to nanobench

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"
 
 // These CPU tile sizes are not good per se, but they are similar to what Chrome uses.
 DEFINE_int32(CPUbenchTileW, 256, "Tile width  used for CPU SKP playback.");
 DEFINE_int32(CPUbenchTileH, 256, "Tile height used for CPU SKP playback.");
 
 DEFINE_int32(GPUbenchTileW, 1600, "Tile width  used for GPU SKP playback.");
 DEFINE_int32(GPUbenchTileH, 512, "Tile height used for GPU SKP playback.");
 
 SKPBench::SKPBench(const char* name, const SkPicture* pic, const SkIRect& clip, SkScalar scale,
-                   bool useMultiPictureDraw)
+                   bool useMultiPictureDraw, bool doLooping)
     : fPic(SkRef(pic))
     , fClip(clip)
     , fScale(scale)
     , fName(name)
-    , fUseMultiPictureDraw(useMultiPictureDraw) {
+    , fUseMultiPictureDraw(useMultiPictureDraw)
+    , fDoLooping(doLooping) {
     fUniqueName.printf("%s_%.2g", name, scale);  // Scale makes this unqiue for perf.skia.org traces.
     if (useMultiPictureDraw) {
         fUniqueName.append("_mpd");
     }
 }
 
 SKPBench::~SKPBench() {
     for (int i = 0; i < fSurfaces.count(); ++i) {
         fSurfaces[i]->unref();
     }
@@ skipping 60 matching lines @@
 
 bool SKPBench::isSuitableFor(Backend backend) {
     return backend != kNonRendering_Backend;
 }
 
 SkIPoint SKPBench::onGetSize() {
     return SkIPoint::Make(fClip.width(), fClip.height());
 }
 
 void SKPBench::onDraw(const int loops, SkCanvas* canvas) {
+    SkASSERT(fDoLooping || 1 == loops);
     if (fUseMultiPictureDraw) {
         for (int i = 0; i < loops; i++) {
             this->drawMPDPicture();
         }
     } else {
         for (int i = 0; i < loops; i++) {
             this->drawPicture();
         }
     }
 }
@@ skipping 19 matching lines @@
     for (int j = 0; j < fTileRects.count(); ++j) {
         const SkMatrix trans = SkMatrix::MakeTrans(-fTileRects[j].fLeft / fScale,
                                                    -fTileRects[j].fTop / fScale);
         fSurfaces[j]->getCanvas()->drawPicture(fPic, &trans, NULL);
     }
 
     for (int j = 0; j < fTileRects.count(); ++j) {
         fSurfaces[j]->getCanvas()->flush();
     }
 }