color: Add --force-color-profile command line flag

ui/gfx/color_space.h

Index: ui/gfx/color_space.h
diff --git a/ui/gfx/color_space.h b/ui/gfx/color_space.h
index 643a69ccbe54694dad5b7a052188686f92b7bdd8..a493a12700dd4ee78387ba9151897384a2a00772 100644
--- a/ui/gfx/color_space.h
+++ b/ui/gfx/color_space.h
@@ -54,6 +54,7 @@ class GFX_EXPORT ColorSpace {
   enum class TransferID : uint8_t {
     INVALID,
     BT709,
+    GAMMA18,
     GAMMA22,
     GAMMA24,
     GAMMA28,
@@ -69,6 +70,9 @@ class GFX_EXPORT ColorSpace {
     BT2020_12,
     SMPTEST2084,
     SMPTEST428_1,
+    // Corresponds the the primaries of the "Generic RGB" profile used in the
+    // Apple ColorSync application, used by layout tests on Mac.
+    APPLE_GENERIC_RGB,
     ARIB_STD_B67,  // AKA hybrid-log gamma, HLG.
     // This is an ad-hoc transfer function that decodes SMPTE 2084 content
     // into a [0, 1] range more or less suitable for viewing on a non-hdr