Modify SkPngCodec to recognize 565 images from the sBIT chunk

src/codec/SkCodec.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 "SkBmpCodec.h"
 #include "SkCodec.h"
 #include "SkCodecPriv.h"
@@ skipping 108 matching lines @@
     : fEncodedInfo(info)
     , fSrcInfo(info.makeImageInfo(width, height, std::move(colorSpace)))
     , fStream(stream)
     , fNeedsRewind(false)
     , fOrigin(origin)
     , fDstInfo()
     , fOptions()
     , fCurrScanline(-1)
 {}
 
+SkCodec::SkCodec(const SkEncodedInfo& info, const SkImageInfo& imageInfo, SkStream* stream,
+        Origin origin)
+    : fEncodedInfo(info)
+    , fSrcInfo(imageInfo)
+    , fStream(stream)
+    , fNeedsRewind(false)
+    , fOrigin(origin)
+    , fDstInfo()
+    , fOptions()
+    , fCurrScanline(-1)
+{}
+
 SkCodec::~SkCodec() {}
 
 bool SkCodec::rewindIfNeeded() {
     if (!fStream) {
         // Some codecs do not have a stream, but they hold others that do. They
         // must handle rewinding themselves.
         return true;
     }
 
     // Store the value of fNeedsRewind so we can update it. Next read will
@@ skipping 242 matching lines @@
             SkASSERT(1 == linesRequested || this->getInfo().height() == linesRequested);
             const SkImageInfo fillInfo = info.makeWH(fillWidth, 1);
             for (int srcY = linesDecoded; srcY < linesRequested; srcY++) {
                 fillDst = SkTAddOffset<void>(dst, this->outputScanline(srcY) * rowBytes);
                 fill_proc(fillInfo, fillDst, rowBytes, fillValue, zeroInit, sampler);
             }
             break;
         }
     }
 }