Use SkMatrix44 for the underlying implementation of ui::Transform

ui/gfx/canvas_skia.cc

Index: ui/gfx/canvas_skia.cc
diff --git a/ui/gfx/canvas_skia.cc b/ui/gfx/canvas_skia.cc
index 3d88276e2ba83314c53c4048a364ad785b35873f..160ca94e80ad2b6d83db0872e8556bc8ebd53c5e 100644
--- a/ui/gfx/canvas_skia.cc
+++ b/ui/gfx/canvas_skia.cc
@@ -331,9 +331,11 @@ void CanvasSkia::EndPlatformPaint() {
   skia::EndPlatformPaint(this);
 }
 
+#if !defined(OS_MACOSX)
 void CanvasSkia::Transform(const ui::Transform& transform) {
   concat(transform.matrix());
 }
+#endif
 
 CanvasSkia* CanvasSkia::AsCanvasSkia() {
   return this;