Apply skew on both axes together rather than sequentially on Compositor thread

ui/gfx/transform_util_unittest.cc

 // 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.
 
 #include "ui/gfx/transform_util.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 152 matching lines @@
   Transform result(Transform::kSkipInitialization);
   Transform transform;
 
 
   transform.RotateAboutZAxis(89.99);
   transform.Scale3d(SkDoubleToMScalar(1.0),
                     SkDoubleToMScalar(3.00001),
                     SkDoubleToMScalar(2.0));
   transform.Translate3d(SkDoubleToMScalar(30.5), SkDoubleToMScalar(20.0),
                         SkDoubleToMScalar(10.1));
-  transform.SkewX(20.0);
+  transform.Skew(20.0, 0.0);
   Rect viewport(1920, 1200);
   bool snapped = SnapTransform(&result, transform, viewport);
   EXPECT_FALSE(snapped) << "Skewed viewport should not snap.";
 }
 
 TEST(TransformUtilTest, TransformAboutPivot) {
   Transform transform;
   transform.Scale(3, 4);
   transform = TransformAboutPivot(Point(7, 8), transform);
 
@@ skipping 16 matching lines @@
   DecomposedTransform result;
   BlendDecomposedTransforms(&result, first, second, 0.25);
   for (size_t i = 0; i < 4; ++i) {
     EXPECT_TRUE(std::isfinite(result.quaternion[i]));
     EXPECT_FALSE(std::isnan(result.quaternion[i]));
   }
 }
 
 }  // namespace
 }  // namespace gfx