color: Clarify default behaviors

ui/gfx/icc_profile.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_ICC_PROFILE_H_
 #define UI_GFX_ICC_PROFILE_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 59 matching lines @@
  private:
   friend ICCProfile ICCProfileForTestingAdobeRGB();
   friend ICCProfile ICCProfileForTestingColorSpin();
   friend ICCProfile ICCProfileForTestingGenericRGB();
   friend ICCProfile ICCProfileForTestingSRGB();
   static const uint64_t test_id_adobe_rgb_;
   static const uint64_t test_id_color_spin_;
   static const uint64_t test_id_generic_rgb_;
   static const uint64_t test_id_srgb_;
 
+  // Populate |icc_profile| with the ICCProfile corresponding to id |id|. Return
+  // false if |id| is not in the cache. If |only_if_needed| is true, then return
+  // false if |color_space_is_accurate_| is true for this profile (that is, if
+  // the ICCProfile is needed to know the space precisely).
+  static bool FromId(uint64_t id, bool only_if_needed, ICCProfile* icc_profile);
+
   // This method is used to hard-code the |id_| to a specific value, and is
   // used by test methods to ensure that they don't conflict with the values
   // generated in the browser.
   static ICCProfile FromDataWithId(const void* icc_profile,
                                    size_t size,
                                    uint64_t id);
 
   static bool IsValidProfileLength(size_t length);
   void ComputeColorSpaceAndCache();
 
   // This globally identifies this ICC profile. It is used to look up this ICC
   // profile from a ColorSpace object created from it. The object is invalid if
   // |id_| is zero.
   uint64_t id_ = 0;
   std::vector<char> data_;
 
   gfx::ColorSpace color_space_;
+  // True if |color_space_| accurately represents this color space (this is
+  // false e.g, for lookup-based profiles).
+  bool color_space_is_accurate_ = false;
 
   FRIEND_TEST_ALL_PREFIXES(SimpleColorSpace, BT709toSRGBICC);
   FRIEND_TEST_ALL_PREFIXES(SimpleColorSpace, GetColorSpace);
   friend int ::LLVMFuzzerTestOneInput(const uint8_t*, size_t);
   friend class ColorSpace;
+  friend class ColorTransformInternal;
   friend struct IPC::ParamTraits<gfx::ICCProfile>;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_ICC_PROFILE_H_