[DevTools] Make UI.GlassPane position contentElement for different overlay controls.

third_party/WebKit/Source/devtools/front_end/ui/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 328 matching lines @@
  */
 UI.Size = class {
   /**
    * @param {number} width
    * @param {number} height
    */
   constructor(width, height) {
     this.width = width;
     this.height = height;
   }
+
+  /**
+   * @param {?UI.Size} size
+   * @return {!UI.Size}
+   */
+  clipTo(size) {
+    if (!size)
+      return this;
+    return new UI.Size(Math.min(this.width, size.width), Math.min(this.height, size.height));
+  }
 };
 
 /**
  * @param {?UI.Size} size
  * @return {boolean}
  */
 UI.Size.prototype.isEqual = function(size) {
   return !!size && this.width === size.width && this.height === size.height;
 };
 
@@ skipping 162 matching lines @@
 
 /**
  * @param {!UI.Constraints|number} value
  * @return {!UI.Constraints}
  */
 UI.Constraints.prototype.addHeight = function(value) {
   if (typeof value === 'number')
     return new UI.Constraints(this.minimum.addHeight(value), this.preferred.addHeight(value));
   return new UI.Constraints(this.minimum.addHeight(value.minimum), this.preferred.addHeight(value.preferred));
 };