Fix nanobench SKP flushes between loops

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"
@@ skipping 92 matching lines @@
 bool SKPBench::isSuitableFor(Backend backend) {
     return backend != kNonRendering_Backend;
 }
 
 SkIPoint SKPBench::onGetSize() {
     return SkIPoint::Make(fClip.width(), fClip.height());
 }
 
 void SKPBench::onDraw(int loops, SkCanvas* canvas) {
     SkASSERT(fDoLooping || 1 == loops);
-    if (fUseMultiPictureDraw) {
-        for (int i = 0; i < loops; i++) {
+    while (1) {
+        if (fUseMultiPictureDraw) {
             this->drawMPDPicture();
-        }
-    } else {
-        for (int i = 0; i < loops; i++) {
+        } else {
             this->drawPicture();
         }
+        if (0 == --loops) {
+            break;
+        }
+#if SK_SUPPORT_GPU
+        // Ensure the GrContext doesn't batch across draw loops.
+        if (GrContext* context = canvas->getGrContext()) {
+            context->flush();
+        }
+#endif
     }
-#if SK_SUPPORT_GPU
-    // Ensure the GrContext doesn't batch across draw loops.
-    if (GrContext* context = canvas->getGrContext()) {
-        context->flush();
-    }
-#endif
 }
 
 void SKPBench::drawMPDPicture() {
     SkMultiPictureDraw mpd;
 
     for (int j = 0; j < fTileRects.count(); ++j) {
         SkMatrix trans;
         trans.setTranslate(-fTileRects[j].fLeft/fScale,
                            -fTileRects[j].fTop/fScale);
         mpd.add(fSurfaces[j]->getCanvas(), fPic, &trans);
@@ skipping 51 matching lines @@
     context->freeGpuResources();
     context->resetContext();
     context->getGpu()->resetShaderCacheForTesting();
     draw_pic_for_stats(canvas, context, fPic, keys, values, "first_frame");
 
     // draw second frame
     draw_pic_for_stats(canvas, context, fPic, keys, values, "second_frame");
 
 #endif
 }