gfx: Create a separate gfx component out of ui.

ui/gfx/rect_base_impl.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.
 
 #include "ui/gfx/rect_base.h"
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 
 // This file provides the implementation for RectBaese template and
 // used to instantiate the base class for Rect and RectF classes.
-#if !defined(UI_IMPLEMENTATION)
+#if !defined(GFX_IMPLEMENTATION)
 #error "This file is intended for UI implementation only"
 #endif
 
 namespace {
 
 template<typename Type>
 void AdjustAlongAxis(Type dst_origin, Type dst_size, Type* origin, Type* size) {
   *size = std::min(dst_size, *size);
   if (*origin < dst_origin)
     *origin = dst_origin;
@@ skipping 301 matching lines @@
     ManhattanDistanceToPoint(const PointClass& point) const {
   Type x_distance = std::max<Type>(0, std::max(
       x() - point.x(), point.x() - right()));
   Type y_distance = std::max<Type>(0, std::max(
       y() - point.y(), point.y() - bottom()));
 
   return x_distance + y_distance;
 }
 
 }  // namespace gfx