color: Add command line flag to force output color space

ui/gfx/icc_profile_unittest.cc

Index: ui/gfx/icc_profile_unittest.cc
diff --git a/ui/gfx/icc_profile_unittest.cc b/ui/gfx/icc_profile_unittest.cc
index 57a52c0c5b83a0254dfebb022d0431b3b45bd52b..590858e29dc238d838def3001072b223f88ff559 100644
--- a/ui/gfx/icc_profile_unittest.cc
+++ b/ui/gfx/icc_profile_unittest.cc
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "ui/gfx/icc_profile.h"
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/color_space.h"
-#include "ui/gfx/icc_profile.h"
+#include "ui/gfx/skia_color_space_util.h"
 #include "ui/gfx/test/icc_profiles.h"
 
 namespace gfx {
@@ -138,4 +139,21 @@ TEST(ICCProfile, GarbageData) {
   EXPECT_FALSE(default_ctor_profile.GetParametricColorSpace().IsValid());
 }
 
+TEST(ICCProfile, GenericRGB) {
+  ColorSpace icc_profile = ICCProfileForTestingGenericRGB().GetColorSpace();
+  ColorSpace color_space(ColorSpace::PrimaryID::APPLE_GENERIC_RGB,
+                         ColorSpace::TransferID::GAMMA18);
+
+  SkMatrix44 icc_profile_matrix;
+  SkMatrix44 color_space_matrix;
+
+  icc_profile.GetPrimaryMatrix(&icc_profile_matrix);
+  color_space.GetPrimaryMatrix(&color_space_matrix);
+
+  SkMatrix44 eye;
+  icc_profile_matrix.invert(&eye);
+  eye.postConcat(color_space_matrix);
+  EXPECT_TRUE(SkMatrixIsApproximatelyIdentity(eye));
+}
+
 }  // namespace gfx