Reverting 25196, 25195, 25192.

tools/dom/src/Dimension.dart

-part of html;
-
-/**
- * Class representing a
- * [length measurement](https://developer.mozilla.org/en-US/docs/Web/CSS/length)
- * in CSS.
- */
-@Experimental()
-class Dimension {
-  num _value;
-  String _unit;
-
-  /** Set this CSS Dimension to a percentage `value`. */
-  Dimension.percent(this._value) : _unit = '%';
-
-  /** Set this CSS Dimension to a pixel `value`. */
-  Dimension.px(this._value) : _unit = 'px';
-
-  /** Set this CSS Dimension to a pica `value`. */
-  Dimension.pc(this._value) : _unit = 'pc';
-
-  /** Set this CSS Dimension to a point `value`. */
-  Dimension.pt(this._value) : _unit = 'pt';
-
-  /** Set this CSS Dimension to an inch `value`. */
-  Dimension.inch(this._value) : _unit = 'in';
-
-  /** Set this CSS Dimension to a centimeter `value`. */
-  Dimension.cm(this._value) : _unit = 'cm';
-
-  /** Set this CSS Dimension to a millimeter `value`. */
-  Dimension.mm(this._value) : _unit = 'mm';
-
-  /**
-   * Set this CSS Dimension to the specified number of ems.
-   *
-   * 1em is equal to the current font size. (So 2ems is equal to double the font
-   * size). This is useful for producing website layouts that scale nicely with
-   * the user's desired font size.
-   */
-  Dimension.em(this._value) : _unit = 'em';
-
-  /**
-   * Set this CSS Dimension to the specified number of x-heights.
-   *
-   * One ex is equal to the the x-height of a font's baseline to its mean line,
-   * generally the height of the letter "x" in the font, which is usually about
-   * half the font-size.
-   */
-  Dimension.ex(this._value) : _unit = 'ex';
-
-  /**
-   * Construct a Dimension object from the valid, simple CSS string `cssValue`
-   * that represents a distance measurement.
-   *
-   * This constructor is intended as a convenience method for working with
-   * simplistic CSS length measurements. Non-numeric values such as `auto` or
-   * `inherit` or invalid CSS will cause this constructor to throw a
-   * FormatError.
-   */
-  Dimension.css(String cssValue) {
-    if (cssValue == '') cssValue = '0px';
-    if (cssValue.endsWith('%')) {
-      _unit = '%';
-    } else {
-      _unit = cssValue.substring(cssValue.length - 2);
-    }
-    if (cssValue.contains('.')) {
-      _value = double.parse(cssValue.substring(0,
-          cssValue.length - _unit.length));
-    } else {
-      _value = int.parse(cssValue.substring(0, cssValue.length - _unit.length));
-    }
-  }
-
-  /** Print out the CSS String representation of this value. */
-  String toString() {
-    return '${_value}${_unit}';
-  }
-
-  /** Return a unitless, numerical value of this CSS value. */
-  num get value => this._value;
-}