[EXPERIMENT] MacViews: Implement Tab Dragging

ui/gfx/geometry/rect.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/geometry/rect.h"
 
 #include <algorithm>
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 272 matching lines @@
 }
 
 Rect BoundingRect(const Point& p1, const Point& p2) {
   int rx = std::min(p1.x(), p2.x());
   int ry = std::min(p1.y(), p2.y());
   int rr = std::max(p1.x(), p2.x());
   int rb = std::max(p1.y(), p2.y());
   return Rect(rx, ry, rr - rx, rb - ry);
 }
 
+Point ConstrainToEnclosingRect(const Rect& rect, const Point& p) {
+  Point result = p;
+  if (result.x() < rect.x())
+    result.set_x(rect.x());
+  if (result.y() < rect.y())
+    result.set_y(rect.y());
+  if (result.x() > rect.right())
+    result.set_x(rect.right());
+  if (result.y() > rect.bottom())
+    result.set_y(rect.bottom());
+  return result;
+}
+
 }  // namespace gfx