color: Add command line flag to force output color space

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 <stdint.h>
 #include <ostream>
 
@@ skipping 24 matching lines @@
     BT470BG,
     SMPTE170M,
     SMPTE240M,
     FILM,
     BT2020,
     SMPTEST428_1,
     SMPTEST431_2,
     SMPTEST432_1,
     XYZ_D50,
     ADOBE_RGB,
+    // Corresponds the the primaries of the "Generic RGB" profile used in the
+    // Apple ColorSync application, used by layout tests on Mac.
+    APPLE_GENERIC_RGB,
     // Primaries defined by the primary matrix |custom_primary_matrix_|.
     CUSTOM,
     // For color spaces defined by an ICC profile which cannot be represented
     // parametrically. Any ColorTransform using this color space will use the
     // ICC profile directly to compute a transform LUT.
     ICC_BASED,
     LAST = ICC_BASED,
   };
 
   enum class TransferID : uint8_t {
     INVALID,
     BT709,
+    GAMMA18,
     GAMMA22,
     GAMMA24,
     GAMMA28,
     SMPTE170M,
     SMPTE240M,
     LINEAR,
     LOG,
     LOG_SQRT,
     IEC61966_2_4,
     BT1361_ECG,
@@ skipping 138 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(SimpleColorSpace, GetColorSpace);
 };
 
 // Stream operator so ColorSpace can be used in assertion statements.
 GFX_EXPORT std::ostream& operator<<(std::ostream& out,
                                     const ColorSpace& color_space);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_COLOR_SPACE_H_