Refactored SkColorSpace and added in a Lab PCS GM

bench/ColorCodecBench.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "ColorCodecBench.h"
 #include "Resources.h"
 #include "SkCodec.h"
 #include "SkCodecPriv.h"
-#include "SkColorSpace_Base.h"
+#include "SkColorSpace_XYZ.h"
 #include "SkColorSpaceXform.h"
 #include "SkCommandLineFlags.h"
 
 #if defined(SK_TEST_QCMS)
 DEFINE_bool(qcms,       false, "Bench qcms color conversion");
 #endif
 DEFINE_bool(xform_only, false, "Only time the color xform, do not include the decode time");
 DEFINE_bool(srgb,       false, "Convert to srgb dst space");
 DEFINE_bool(nonstd,     false, "Convert to non-standard dst space");
 DEFINE_bool(half,       false, "Convert to half floats");
@@ skipping 140 matching lines @@
         fDstSpace = FLAGS_srgb ? SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named) :
                                  SkColorSpace::NewICC(dstData->data(), dstData->size());
         SkASSERT(fDstSpace);
     }
 
     fSrcInfo = codec->getInfo().makeColorType(kRGBA_8888_SkColorType);
     fDstInfo = fSrcInfo;
 
     if (FLAGS_half) {
         fDstInfo = fDstInfo.makeColorType(kRGBA_F16_SkColorType);
-        fDstSpace = as_CSB(fDstSpace)->makeLinearGamma();
+        SkASSERT(SkColorSpace_Base::Type::kXYZ == as_CSB(fDstSpace)->type());
+        fDstSpace = static_cast<SkColorSpace_XYZ*>(fDstSpace.get())->makeLinearGamma();
     }
 
     if (FLAGS_nonstd) {
         float gammas[3] = { 1.8f, 2.0f, 2.5f, };
         SkMatrix44 matrix = SkMatrix44(SkMatrix44::kUninitialized_Constructor);
         matrix.set3x3(0.30f, 0.31f, 0.28f, 0.32f, 0.33f, 0.29f, 0.27f, 0.30f, 0.30f);
         fDstSpace = SkColorSpace::NewRGB(gammas, matrix);
     }
 
     fDstInfo = fDstInfo.makeColorSpace(fDstSpace);
@@ skipping 32 matching lines @@
 #endif
         {
             if (FLAGS_xform_only) {
                 this->xformOnly();
             } else {
                 this->decodeAndXform();
             }
         }
     }
 }