Migrate ui::Transform to gfx::Transform

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.
 
 #include "ui/gfx/transform.h"
 
 #include "ui/gfx/point3.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/skia_util.h"
 
 namespace {
 
 static int SymmetricRound(float x) {
   return static_cast<int>(
     x > 0
       ? std::floor(x + 0.5f)
       : std::ceil(x - 0.5f));
 }
 
 } // namespace
 
-namespace ui {
+namespace gfx {
 
 Transform::Transform() {
   matrix_.reset();
 }
 
 Transform::~Transform() {}
 
 bool Transform::operator==(const Transform& rhs) const {
   return matrix_ == rhs.matrix_;
 }
@@ skipping 164 matching lines @@
     SkIntToScalar(point.y()),
     0,
     1 };
 
   xform.map(p);
 
   point.SetPoint(SymmetricRound(p[0]),
                  SymmetricRound(p[1]));
 }
 
-}  // namespace ui
+}  // namespace gfx