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

ui/gfx/transform.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.
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "ui/gfx/transform.h"
 
 #include <cmath>
@@ skipping 166 matching lines @@
 }
 
 void Transform::Translate(SkMScalar x, SkMScalar y) {
   matrix_.preTranslate(x, y, 0);
 }
 
 void Transform::Translate3d(SkMScalar x, SkMScalar y, SkMScalar z) {
   matrix_.preTranslate(x, y, z);
 }
 
-void Transform::SkewX(double angle_x) {
+void Transform::Skew(double angle_x, double angle_y) {
   if (matrix_.isIdentity()) {
     matrix_.set(0, 1, TanDegrees(angle_x));
+    matrix_.set(1, 0, TanDegrees(angle_y));
   } else {
     SkMatrix44 skew(SkMatrix44::kIdentity_Constructor);
     skew.set(0, 1, TanDegrees(angle_x));
-    matrix_.preConcat(skew);
-  }
-}
-
-void Transform::SkewY(double angle_y) {
-  if (matrix_.isIdentity()) {
-    matrix_.set(1, 0, TanDegrees(angle_y));
-  } else {
-    SkMatrix44 skew(SkMatrix44::kIdentity_Constructor);
     skew.set(1, 0, TanDegrees(angle_y));
     matrix_.preConcat(skew);
   }
 }
 
 void Transform::ApplyPerspectiveDepth(SkMScalar depth) {
   if (depth == 0)
     return;
   if (matrix_.isIdentity()) {
     matrix_.set(3, 2, -SK_MScalar1 / depth);
@@ skipping 348 matching lines @@
       matrix_.get(2, 1),
       matrix_.get(2, 2),
       matrix_.get(2, 3),
       matrix_.get(3, 0),
       matrix_.get(3, 1),
       matrix_.get(3, 2),
       matrix_.get(3, 3));
 }
 
 }  // namespace gfx