Remove superfluous error messages from nanobench

tools/SkBitmapRegionCanvas.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 "SkBitmapRegionCanvas.h"
 #include "SkCanvas.h"
 
@@ skipping 38 matching lines @@
  *     Android version attempts to reuse a recycled bitmap.
  *     Removed the options object and used parameters for color type and
  *     sample size.
  */
 SkBitmap* SkBitmapRegionCanvas::decodeRegion(int inputX, int inputY,
                                              int inputWidth, int inputHeight,
                                              int sampleSize,
                                              SkColorType dstColorType) {
     // Reject color types not supported by this method
     if (kIndex_8_SkColorType == dstColorType || kGray_8_SkColorType == dstColorType) {
-        SkDebugf("Error: Color type not supported.\n");
         return nullptr;
     }
 
     // The client may not necessarily request a region that is fully within
     // the image.  We may need to do some calculation to determine what part
     // of the image to decode.
 
     // The left offset of the portion of the image we want, where zero
     // indicates the left edge of the image.
     int imageSubsetX;
@@ skipping 38 matching lines @@
     SkAlphaType dstAlphaType = fDecoder->getInfo().alphaType();
     if (kUnpremul_SkAlphaType == dstAlphaType) {
         dstAlphaType = kPremul_SkAlphaType;
     }
     SkImageInfo decodeInfo = SkImageInfo::Make(this->width(), this->height(),
             dstColorType, dstAlphaType);
     
     // Start the scanline decoder
     SkCodec::Result r = fDecoder->startScanlineDecode(decodeInfo);
     if (SkCodec::kSuccess != r) {
-        SkDebugf("Error: Could not start scanline decoder.\n");
         return nullptr;
     }
 
     // Allocate a bitmap for the unscaled decode
     SkBitmap tmp;
     SkImageInfo tmpInfo = decodeInfo.makeWH(this->width(), imageSubsetHeight);
     if (!tmp.tryAllocPixels(tmpInfo)) {
         SkDebugf("Error: Could not allocate pixels.\n");
         return nullptr;
     }
@@ skipping 50 matching lines @@
             (SkScalar) get_scaled_dimension(imageSubsetWidth, sampleSize),
             (SkScalar) get_scaled_dimension(imageSubsetHeight, sampleSize));
     SkPaint paint;
     // Overwrite the dst with the src pixels
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     // TODO (msarett): Test multiple filter qualities.  kNone is the default.
     canvas.drawBitmapRect(tmp, src, dst, &paint);
 
     return bitmap.detach();
 }