color: Don't use QCMS for transforms unless necessary

ui/gfx/color_transform_unittest.cc

 // Copyright (c) 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.
 
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/color_space.h"
 #include "ui/gfx/color_transform.h"
 #include "ui/gfx/icc_profile.h"
 #include "ui/gfx/test/icc_profiles.h"
@@ skipping 79 matching lines @@
   ICCProfile srgb_icc_profile = ICCProfileForTestingSRGB();
   ColorSpace srgb_fromicc = srgb_icc_profile.GetColorSpace();
   ColorSpace srgb_default = gfx::ColorSpace::CreateSRGB();
   ColorSpace xyzd50 = gfx::ColorSpace::CreateXYZD50();
 
   value_fromicc = value_default = ColorTransform::TriStim(0.1f, 0.5f, 0.9f);
 
   std::unique_ptr<ColorTransform> toxyzd50_fromicc(
       ColorTransform::NewColorTransform(
           srgb_fromicc, xyzd50, ColorTransform::Intent::INTENT_ABSOLUTE));
-  // This will have 1 step, namely, the QCMS transform.
-  EXPECT_EQ(toxyzd50_fromicc->NumberOfStepsForTesting(), 1u);
+  // This will be converted to a transfer function and then linear transform.
+  EXPECT_EQ(toxyzd50_fromicc->NumberOfStepsForTesting(), 2u);
   toxyzd50_fromicc->Transform(&value_fromicc, 1);
 
   std::unique_ptr<ColorTransform> toxyzd50_default(
       ColorTransform::NewColorTransform(
           srgb_default, xyzd50, ColorTransform::Intent::INTENT_ABSOLUTE));
   // This will have a transfer function and then linear transform.
   EXPECT_EQ(toxyzd50_default->NumberOfStepsForTesting(), 2u);
   toxyzd50_default->Transform(&value_default, 1);
 
   EXPECT_NEAR(value_fromicc.x(), value_default.x(), kEpsilon);
@@ skipping 221 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(
     C,
     ColorSpaceTest,
     testing::Combine(testing::ValuesIn(all_primaries),
                      testing::Values(ColorSpace::TransferID::BT709),
                      testing::ValuesIn(all_matrices),
                      testing::ValuesIn(all_ranges),
                      testing::ValuesIn(intents)));
 }  // namespace