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

ui/gfx/transform.h

 // 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.
 
 #ifndef UI_GFX_TRANSFORM_H_
 #define UI_GFX_TRANSFORM_H_
 
 #include <iosfwd>
 #include <string>
 
@@ skipping 83 matching lines @@
     return gfx::Vector2dF(matrix_.get(0, 0), matrix_.get(1, 1));
   }
 
   // Applies the current transformation on a translation and assigns the result
   // to |this|.
   void Translate(SkMScalar x, SkMScalar y);
   void Translate3d(SkMScalar x, SkMScalar y, SkMScalar z);
 
   // Applies the current transformation on a skew and assigns the result
   // to |this|.
-  void SkewX(double angle_x);
-  void SkewY(double angle_y);
+  void Skew(double angle_x, double angle_y);
 
   // Applies the current transformation on a perspective transform and assigns
   // the result to |this|.
   void ApplyPerspectiveDepth(SkMScalar depth);
 
   // Applies a transformation on the current transformation
   // (i.e. 'this = this * transform;').
   void PreconcatTransform(const Transform& transform);
 
   // Applies a transformation on the current transformation
@@ skipping 155 matching lines @@
 };
 
 // This is declared here for use in gtest-based unit tests but is defined in
 // the gfx_test_support target. Depend on that to use this in your unit test.
 // This should not be used in production code - call ToString() instead.
 void PrintTo(const Transform& transform, ::std::ostream* os);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_TRANSFORM_H_