Expose more gamma info for UMA statistics

include/core/SkColorSpace.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkColorSpace_DEFINED
 #define SkColorSpace_DEFINED
 
@@ skipping 24 matching lines @@
         kSRGB_GammaNamed,
 
         /**
          *  Gamma curve is a close match to the 2.2f exponential curve.  This is
          *  used by Adobe RGB profiles and is common on monitors as well.
          */
         k2Dot2Curve_GammaNamed,
 
         /**
          *  Gamma is represented by a look-up table, a parametric curve, or an uncommon
-         *  exponential curve.  Or there is an additional pre-processing step before the
-         *  applying the gamma.
+         *  exponential curve.  Or the R, G, and B gammas do not match.
          */
         kNonStandard_GammaNamed,
+
+        /**
+         *  To be used by UMA code only.  ICC profiles lacks valid gamma representation.
+         */
+        kInvalid_GammaNamed,
     };
 
     /**
      *  Create an SkColorSpace from the src gamma and a transform from src gamut to D50 XYZ.
      */
     static sk_sp<SkColorSpace> NewRGB(GammaNamed gammaNamed, const SkMatrix44& toXYZD50);
 
     /**
      *  Create a common, named SkColorSpace.
      */
@@ skipping 12 matching lines @@
     const SkMatrix44& xyz() const { return fToXYZD50; }
 
     /**
      *  Returns true if the color space gamma is near enough to be approximated as sRGB.
      */
     bool gammaCloseToSRGB() const {
         return kSRGB_GammaNamed == fGammaNamed || k2Dot2Curve_GammaNamed == fGammaNamed;
     }
 
     /**
+     *  To be used only by UMA code.
+     */
+    bool gammasAreMatching() const;
+    bool gammasAreNamed() const;
+    bool gammasAreValues() const;
+    bool gammasAreTables() const;
+    bool gammasAreParams() const;
+
+    /**
      *  Returns nullptr on failure.  Fails when we fallback to serializing ICC data and
      *  the data is too large to serialize.
      */
     sk_sp<SkData> serialize() const;
 
     static sk_sp<SkColorSpace> Deserialize(const void* data, size_t length);
 
 protected:
     SkColorSpace(GammaNamed gammaNamed, const SkMatrix44& toXYZD50, Named named);
 
     const GammaNamed fGammaNamed;
     const SkMatrix44 fToXYZD50;
     const Named      fNamed;
 };
 
 #endif