Move toXYZD50() to SkColorSpace_Base

src/core/SkColorSpaceXform.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 "SkColorPriv.h"
 #include "SkColorSpace_Base.h"
 #include "SkColorSpacePriv.h"
@@ skipping 337 matching lines @@
         // Invalid input
         return nullptr;
     }
 
     ColorSpaceMatch csm = kNone_ColorSpaceMatch;
     SkMatrix44 srcToDst(SkMatrix44::kUninitialized_Constructor);
     if (SkColorSpace::Equals(srcSpace, dstSpace)) {
         srcToDst.setIdentity();
         csm = kFull_ColorSpaceMatch;
     } else {
-        srcToDst.setConcat(as_CSB(dstSpace)->fromXYZD50(), srcSpace->toXYZD50());
+        srcToDst.setConcat(as_CSB(dstSpace)->fromXYZD50(), as_CSB(srcSpace)->toXYZD50());
 
         if (is_almost_identity(srcToDst)) {
             srcToDst.setIdentity();
             csm = kGamut_ColorSpaceMatch;
         }
     }
 
     switch (csm) {
         case kNone_ColorSpaceMatch:
             switch (as_CSB(dstSpace)->gammaNamed()) {
@@ skipping 1062 matching lines @@
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace* space) {
         return std::unique_ptr<SkColorSpaceXform>(new SkColorSpaceXform_Base
                 <kTable_SrcGamma, kTable_DstGamma, kNone_ColorSpaceMatch>
                 (space, SkMatrix::I(), space));
 }