Add color space xform support to SkJpegCodec (includes F16!)

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 268 matching lines @@
      *         to the info returned by getInfo().
      *
      *         This contract also allows the caller to specify
      *         different output-configs, which the implementation can
      *         decide to support or not.
      *
      *         A size that does not match getInfo() implies a request
      *         to scale. If the generator cannot perform this scale,
      *         it will return kInvalidScale.
      *
+     *         If the info contains a non-null SkColorSpace, the codec
+     *         will perform the appropriate color space transformation.
+     *         If the caller passes in the same color space that was
+     *         reported by the codec, the color space transformation is
+     *         a no-op.
+     *
      *  If info is kIndex8_SkColorType, then the caller must provide storage for up to 256
      *  SkPMColor values in ctable. On success the generator must copy N colors into that storage,
      *  (where N is the logical number of table entries) and set ctableCount to N.
      *
      *  If info is not kIndex8_SkColorType, then the last two parameters may be NULL. If ctableCount
      *  is not null, it will be set to 0.
      *
      *  If a scanline decode is in progress, scanline mode will end, requiring the client to call
      *  startScanlineDecode() in order to return to decoding scanlines.
      *
@@ skipping 415 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