Hack together MSAN build.

src/images/SkImageDecoder_libjpeg.cpp

 /*
  * Copyright 2007 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
 #include "SkJpegUtility.h"
 #include "SkColorPriv.h"
 #include "SkDither.h"
+#include "SkMSAN.h"
 #include "SkScaledBitmapSampler.h"
 #include "SkStream.h"
 #include "SkTemplates.h"
 #include "SkTime.h"
 #include "SkUtils.h"
 #include "SkRTConf.h"
 #include "SkRect.h"
 #include "SkCanvas.h"
 
 
@@ skipping 493 matching lines @@
             return kPartialSuccess;
         }
         if (this->shouldCancelDecode()) {
             return return_failure(cinfo, *bm, "shouldCancelDecode");
         }
 
         if (JCS_CMYK == cinfo.out_color_space) {
             convert_CMYK_to_RGB(srcRow, cinfo.output_width);
         }
 
+        sk_msan_mark_initialized(srcRow, srcRow + cinfo.output_width * srcBytesPerPixel,
+                                 "skbug.com/4550");
+
         sampler.next(srcRow);
         if (bm->height() - 1 == y) {
             // we're done
             break;
         }
 
         if (!skip_src_rows(&cinfo, srcRow, sampler.srcDY() - 1)) {
             return return_failure(cinfo, *bm, "skip rows");
         }
     }
@@ skipping 487 matching lines @@
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageEncoder* sk_libjpeg_efactory(SkImageEncoder::Type t) {
     return (SkImageEncoder::kJPEG_Type == t) ? new SkJPEGImageEncoder : nullptr;
 }
 
 static SkImageDecoder_DecodeReg gDReg(sk_libjpeg_dfactory);
 static SkImageDecoder_FormatReg gFormatReg(get_format_jpeg);
 static SkImageEncoder_EncodeReg gEReg(sk_libjpeg_efactory);