[DevTools] Extract platform module.

Source/devtools/front_end/common/Geometry.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 230 matching lines @@
 };
 
 /**
  * @param {!Size|number} size
  * @return {!Size}
  */
 Size.prototype.addHeight = function(size)
 {
     return new Size(this.width, this.height + (typeof size === "number" ? size : size.height));
 };
+
+
+/**
+ * @constructor
+ * @param {!Size} minimum
+ * @param {?Size=} preferred
+ */
+function Constraints(minimum, preferred)
+{
+    /**
+     * @type {!Size}
+     */
+    this.minimum = minimum;
+
+    /**
+     * @type {!Size}
+     */
+    this.preferred = preferred || minimum;
+
+    if (this.minimum.width > this.preferred.width || this.minimum.height > this.preferred.height)
+        throw new Error("Minimum size is greater than preferred.");
+}
+
+/**
+ * @param {?Constraints} constraints
+ * @return {boolean}
+ */
+Constraints.prototype.isEqual = function(constraints)
+{
+    return !!constraints && this.minimum.isEqual(constraints.minimum) && this.preferred.isEqual(constraints.preferred);
+}
+
+/**
+ * @param {!Constraints|number} value
+ * @return {!Constraints}
+ */
+Constraints.prototype.widthToMax = function(value)
+{
+    if (typeof value === "number")
+        return new Constraints(this.minimum.widthToMax(value), this.preferred.widthToMax(value));
+    return new Constraints(this.minimum.widthToMax(value.minimum), this.preferred.widthToMax(value.preferred));
+}
+
+/**
+ * @param {!Constraints|number} value
+ * @return {!Constraints}
+ */
+Constraints.prototype.addWidth = function(value)
+{
+    if (typeof value === "number")
+        return new Constraints(this.minimum.addWidth(value), this.preferred.addWidth(value));
+    return new Constraints(this.minimum.addWidth(value.minimum), this.preferred.addWidth(value.preferred));
+}
+
+/**
+ * @param {!Constraints|number} value
+ * @return {!Constraints}
+ */
+Constraints.prototype.heightToMax = function(value)
+{
+    if (typeof value === "number")
+        return new Constraints(this.minimum.heightToMax(value), this.preferred.heightToMax(value));
+    return new Constraints(this.minimum.heightToMax(value.minimum), this.preferred.heightToMax(value.preferred));
+}
+
+/**
+ * @param {!Constraints|number} value
+ * @return {!Constraints}
+ */
+Constraints.prototype.addHeight = function(value)
+{
+    if (typeof value === "number")
+        return new Constraints(this.minimum.addHeight(value), this.preferred.addHeight(value));
+    return new Constraints(this.minimum.addHeight(value.minimum), this.preferred.addHeight(value.preferred));
+}