Color: Don't duplicate ICC profile data

ui/gfx/color_space.h

 // Copyright (c) 2012 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_COLOR_SPACE_H_
 #define UI_GFX_COLOR_SPACE_H_
 
 #include <vector>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "ui/gfx/gfx_export.h"
 
 #if defined(OS_MACOSX)
 #include <CoreGraphics/CGColorSpace.h>
 #endif
 
 namespace gfx {
 
 class GFX_EXPORT ColorSpace {
  public:
   ColorSpace();
   ColorSpace(ColorSpace&& other);
   ColorSpace(const ColorSpace& other);
   ColorSpace& operator=(const ColorSpace& other);
   ~ColorSpace();
   bool operator==(const ColorSpace& other) const;
+  bool operator<(const ColorSpace& other) const;
 
   // Returns the color profile of the monitor that can best represent color.
   // This profile should be used for creating content that does not know on
   // which monitor it will be displayed.
   static ColorSpace FromBestMonitor();
   static ColorSpace FromICCProfile(const std::vector<char>& icc_profile);
 #if defined(OS_MACOSX)
   static ColorSpace FromCGColorSpace(CGColorSpaceRef cg_color_space);
 #endif
 
-  const std::vector<char>& GetICCProfile() const { return icc_profile_; }
+  const std::vector<char>& GetICCProfile() const;
 
 #if defined(OS_WIN)
   // This will read monitor ICC profiles from disk and cache the results for the
   // other functions to read. This should not be called on the UI or IO thread.
   static void UpdateCachedProfilesOnBackgroundThread();
   static bool CachedProfilesNeedUpdate();
 #endif
 
   static bool IsValidProfileLength(size_t length);
 
  private:
-  std::vector<char> icc_profile_;
+  struct Key;
+  class GlobalData;
+  friend struct Key;
+  friend class GlobalData;
+  enum class Type {
+    UNDEFINED,
+    ICC_PROFILE,
+  };
+  Type type_ = Type::UNDEFINED;
+
+  // GlobalData stores large or expensive-to-compute data about a color space
+  // (e.g, ICC profile). This structure is shared by all identical ColorSpace
+  // objects in the process. It is lazily initialized for named color spaces.
+  mutable scoped_refptr<GlobalData> global_data_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_COLOR_SPACE_H_