Call notifyPixelsChanged after modifying bitmap

dm/DMSrcSink.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 "DMSrcSink.h"
 #include "SamplePipeControllers.h"
 #include "SkCodec.h"
@@ skipping 256 matching lines @@
                      * may be faster for other types of images.  Since this is a correctness test
                      * that's okay.
                     */
                     char* bufferRow = buffer;
                     for (int subsetY = 0; subsetY < currentSubsetHeight; ++subsetY) {
                         memcpy(subsetBm.getAddr(0, subsetY), bufferRow + x*bpp,
                                 currentSubsetWidth*bpp);
                         bufferRow += rowBytes;
                     }
 
+                    subsetBm.notifyPixelsChanged();
                     canvas->drawBitmap(subsetBm, SkIntToScalar(x), SkIntToScalar(y));
                 }
             }
             break;
         }
         case kStripe_Mode: {
             const int height = decodeInfo.height();
             // This value is chosen arbitrarily.  We exercise more cases by choosing a value that
             // does not align with image blocks.
             const int stripeHeight = 37;
@@ skipping 779 matching lines @@
             skr.visit<void>(i, drawsAsSingletonPictures);
         }
         SkAutoTUnref<SkPicture> macroPic(macroRec.endRecordingAsPicture());
 
         canvas->drawPicture(macroPic);
         return "";
     });
 }
 
 }  // namespace DM