Make singleton SkColorSpaces thread safe

src/core/SkColorSpace.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 "SkColorSpace.h"
 #include "SkColorSpace_Base.h"
 #include "SkColorSpacePriv.h"
@@ skipping 118 matching lines @@
     static SkOnce sRGBOnce;
     static sk_sp<SkColorSpace> sRGB;
     static SkOnce adobeRGBOnce;
     static sk_sp<SkColorSpace> adobeRGB;
 
     switch (named) {
         case kSRGB_Named: {
             sRGBOnce([] {
                 SkMatrix44 srgbToxyzD50(SkMatrix44::kUninitialized_Constructor);
                 srgbToxyzD50.set3x3RowMajorf(gSRGB_toXYZD50);
+
+                // Force the mutable type mask to be computed.  This avoids races.
+                (void)srgbToxyzD50.getType();
                 sRGB.reset(new SkColorSpace_Base(kSRGB_GammaNamed, srgbToxyzD50, kSRGB_Named));
             });
             return sRGB;
         }
         case kAdobeRGB_Named: {
             adobeRGBOnce([] {
                 SkMatrix44 adobergbToxyzD50(SkMatrix44::kUninitialized_Constructor);
                 adobergbToxyzD50.set3x3RowMajorf(gAdobeRGB_toXYZD50);
+
+                // Force the mutable type mask to be computed.  This avoids races.
+                (void)adobergbToxyzD50.getType();
                 adobeRGB.reset(new SkColorSpace_Base(k2Dot2Curve_GammaNamed, adobergbToxyzD50,
                                                      kAdobeRGB_Named));
             });
             return adobeRGB;
         }
         default:
             break;
     }
     return nullptr;
 }
@@ skipping 237 matching lines @@
            gammas->fBlueType == SkGammas::Type::kTable_Type;
 }
 
 bool SkColorSpace::gammasAreParams() const {
     const SkGammas* gammas = as_CSB(this)->gammas();
     SkASSERT(gammas);
     return gammas->fRedType == SkGammas::Type::kParam_Type &&
            gammas->fGreenType == SkGammas::Type::kParam_Type &&
            gammas->fBlueType == SkGammas::Type::kParam_Type;
 }