Move client/{base, observable, layout, touch, util, view} to samples/ui_lib .

client/touch/Math.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// TODO(jacobr): pick a better name. This was goog.math in Closure.
-/**
- * Math utility functions originally from the closure Math library.
- */
-class GoogleMath {
-  /**
-   * Takes a [value] and clamps it to within the bounds specified by
-   * [min] and [max].
-   */
-  static num clamp(num value, num min, num max) {
-    return Math.min(Math.max(value, min), max);
-  }
-
-  /**
-   * Tests whether the two values are equal to each other, within a certain
-   * tolerance to adjust for floating point errors.
-   * The optional [tolerance] value d Defaults to 0.000001. If specified,
-   * it should be greater than 0.
-   * Returns whether [a] and [b] are nearly equal.
-   */
-  static bool nearlyEquals(num a, num b, [num tolerance = 0.000001]) {
-    return (a - b).abs() <= tolerance;
-  }
-}