Modify SkPngCodec to recognize 565 images from the sBIT chunk

include/codec/SkCodec.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCodec_DEFINED
 #define SkCodec_DEFINED
 
@@ skipping 508 matching lines @@
     /**
      *  Takes ownership of SkStream*
      */
     SkCodec(int width,
             int height,
             const SkEncodedInfo&,
             SkStream*,
             sk_sp<SkColorSpace> = nullptr,
             Origin = kTopLeft_Origin);
 
+    /**
+     *  Takes ownership of SkStream*
+     *  Allows the subclass to set the recommended SkImageInfo
+     */
+    SkCodec(const SkEncodedInfo&,
+            const SkImageInfo&,
+            SkStream*,
+            Origin = kTopLeft_Origin);
+
     virtual SkISize onGetScaledDimensions(float /*desiredScale*/) const {
         // By default, scaling is not supported.
         return this->getInfo().dimensions();
     }
 
     // FIXME: What to do about subsets??
     /**
      *  Subclasses should override if they support dimensions other than the
      *  srcInfo's.
      */
@@ skipping 181 matching lines @@
 
     // For testing with qcms
     // FIXME: Remove these when we are done comparing with qcms.
     friend class DM::ColorCodecSrc;
     friend class ColorCodecBench;
 
     friend class SkSampledCodec;
     friend class SkIcoCodec;
 };
 #endif // SkCodec_DEFINED