Disable preemptive batch preparation

src/gpu/GrBatchAtlas.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBatchAtlas.h"
 #include "GrBatchFlushState.h"
 #include "GrRectanizer.h"
@@ skipping 313 matching lines @@
     this->processEviction(plot->id());
     fPlotList.remove(plot);
     SkAutoTUnref<BatchPlot>& newPlot = fPlotArray[plot->index()];
     newPlot.reset(plot->clone());
 
     fPlotList.addToHead(newPlot.get());
     SkASSERT(GrBytesPerPixel(fTexture->desc().fConfig) == newPlot->bpp());
     SkDEBUGCODE(bool verify = )newPlot->addSubImage(width, height, image, loc);
     SkASSERT(verify);
 
+    // Note that this plot will be uploaded inline with the draws whereas the
+    // one it displaced most likely was uploaded asap.
     newPlot->setLastUploadToken(batchTarget->currentToken());
     SkAutoTUnref<GrPlotUploader> uploader(new GrPlotUploader(newPlot, fTexture));
     batchTarget->upload(uploader);
     *id = newPlot->id();
 
     fAtlasGeneration++;
     return true;
 }
 
 bool GrBatchAtlas::hasID(AtlasID id) {
@@ skipping 12 matching lines @@
 
 void GrBatchAtlas::setLastUseTokenBulk(const BulkUseTokenUpdater& updater,
                                        GrBatchToken batchToken) {
     int count = updater.fPlotsToUpdate.count();
     for (int i = 0; i < count; i++) {
         BatchPlot* plot = fPlotArray[updater.fPlotsToUpdate[i]];
         this->makeMRU(plot);
         plot->setLastUseToken(batchToken);
     }
 }