Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/iron-image/iron-image.html

-<!--
-@license
-Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
--->
-
-<link rel="import" href="../polymer/polymer.html">
-<link rel="import" href="../iron-flex-layout/classes/iron-flex-layout.html">
-
-<!--
-`iron-image` is an element for displaying an image that provides useful sizing and
-preloading options not found on the standard `<img>` tag.
-
-The `sizing` option allows the image to be either cropped (`cover`) or
-letterboxed (`contain`) to fill a fixed user-size placed on the element.
-
-The `preload` option prevents the browser from rendering the image until the
-image is fully loaded.  In the interim, either the element's CSS `background-color`
-can be be used as the placeholder, or the `placeholder` property can be
-set to a URL (preferably a data-URI, for instant rendering) for an
-placeholder image.
-
-The `fade` option (only valid when `preload` is set) will cause the placeholder
-image/color to be faded out once the image is rendered.
-
-Examples:
-
-  Basically identical to &lt;img src="..."&gt; tag:
-
-    <iron-image src="http://lorempixel.com/400/400"></iron-image>
-
-  Will letterbox the image to fit:
-
-    <iron-image style="width:400px; height:400px;" sizing="contain"
-      src="http://lorempixel.com/600/400"></iron-image>
-
-  Will crop the image to fit:
-
-    <iron-image style="width:400px; height:400px;" sizing="cover"
-      src="http://lorempixel.com/600/400"></iron-image>
-
-  Will show light-gray background until the image loads:
-
-    <iron-image style="width:400px; height:400px; background-color: lightgray;"
-      sizing="cover" preload src="http://lorempixel.com/600/400"></iron-image>
-
-  Will show a base-64 encoded placeholder image until the image loads:
-
-    <iron-image style="width:400px; height:400px;" placeholder="data:image/gif;base64,..."
-      sizing="cover" preload src="http://lorempixel.com/600/400"></iron-image>
-
-  Will fade the light-gray background out once the image is loaded:
-
-    <iron-image style="width:400px; height:400px; background-color: lightgray;"
-      sizing="cover" preload fade src="http://lorempixel.com/600/400"></iron-image>
-
-
-@group Iron Elements
-@element iron-image
-@demo demo/index.html
--->
-
-<dom-module id="iron-image">
-
-  <style>
-
-    :host {
-      display: inline-block;
-      overflow: hidden;
-      position: relative;
-    }
-
-    :host([sizing]) #img {
-      display: none;
-    }
-
-    #placeholder {
-      background-color: inherit;
-      opacity: 1;
-    }
-
-    #placeholder.faded-out {
-      transition: opacity 0.5s linear;
-      opacity: 0;
-    }
-
-  </style>
-
-  <template>
-
-    <img id="img" role="none" hidden$="[[_computeImageVisibility(sizing)]]">
-    <div id="placeholder" hidden$="[[_computePlaceholderVisibility(fade,loaded,preload)]]" class$="[[_computePlaceholderClassName(fade,loaded,preload)]]"></div>
-    <content></content>
-
-  </template>
-
-</dom-module>
-
-<script>
-
-  Polymer({
-
-    is: 'iron-image',
-
-    properties: {
-      /**
-       * The URL of an image.
-       */
-      src: {
-        observer: '_srcChanged',
-        type: String,
-        value: ''
-      },
-
-      /**
-       * When true, the image is prevented from loading and any placeholder is
-       * shown.  This may be useful when a binding to the src property is known to
-       * be invalid, to prevent 404 requests.
-       */
-      preventLoad: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * Sets a sizing option for the image.  Valid values are `contain` (full
-       * aspect ratio of the image is contained within the element and
-       * letterboxed) or `cover` (image is cropped in order to fully cover the
-       * bounds of the element), or `null` (default: image takes natural size).
-       */
-      sizing: {
-        type: String,
-        value: null
-      },
-
-      /**
-       * When a sizing option is uzed (`cover` or `contain`), this determines
-       * how the image is aligned within the element bounds.
-       */
-      position: {
-        type: String,
-        value: 'center'
-      },
-
-      /**
-       * When `true`, any change to the `src` property will cause the `placeholder`
-       * image to be shown until the
-       */
-      preload: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * This image will be used as a background/placeholder until the src image has
-       * loaded.  Use of a data-URI for placeholder is encouraged for instant rendering.
-       */
-      placeholder: {
-        type: String,
-        value: null
-      },
-
-      /**
-       * When `preload` is true, setting `fade` to true will cause the image to
-       * fade into place.
-       */
-      fade: {
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * Read-only value that is true when the image is loaded.
-       */
-      loaded: {
-        notify: true,
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * Read-only value that tracks the loading state of the image when the `preload`
-       * option is used.
-       */
-      loading: {
-        notify: true,
-        type: Boolean,
-        value: false
-      },
-
-      /**
-       * Can be used to set the width of image (e.g. via binding); size may also be
-       * set via CSS.
-       */
-      width: {
-        observer: '_widthChanged',
-        type: Number,
-        value: null
-      },
-
-      /**
-       * Can be used to set the height of image (e.g. via binding); size may also be
-       * set via CSS.
-       *
-       * @attribute height
-       * @type number
-       * @default null
-       */
-      height: {
-        observer: '_heightChanged',
-        type: Number,
-        value: null
-      },
-
-      _placeholderBackgroundUrl: {
-        type: String,
-        computed: '_computePlaceholderBackgroundUrl(preload,placeholder)',
-        observer: '_placeholderBackgroundUrlChanged'
-      },
-
-      requiresPreload: {
-        type: Boolean,
-        computed: '_computeRequiresPreload(preload,loaded)'
-      },
-
-      canLoad: {
-        type: Boolean,
-        computed: '_computeCanLoad(preventLoad, src)'
-      }
-
-    },
-
-    observers: [
-      '_transformChanged(sizing, position)',
-      '_loadBehaviorChanged(canLoad, preload, loaded)',
-      '_loadStateChanged(src, preload, loaded)',
-    ],
-
-    ready: function() {
-      if (!this.hasAttribute('role')) {
-        this.setAttribute('role', 'img');
-      }
-    },
-
-    _computeImageVisibility: function() {
-      return !!this.sizing;
-    },
-
-    _computePlaceholderVisibility: function() {
-      return !this.preload || (this.loaded && !this.fade);
-    },
-
-    _computePlaceholderClassName: function() {
-      if (!this.preload) {
-        return '';
-      }
-
-      var className = 'fit';
-      if (this.loaded && this.fade) {
-        className += ' faded-out';
-      }
-      return className;
-    },
-
-    _computePlaceholderBackgroundUrl: function() {
-      if (this.preload && this.placeholder) {
-        return 'url(' + this.placeholder + ')';
-      }
-
-      return null;
-    },
-
-    _computeRequiresPreload: function() {
-      return this.preload && !this.loaded;
-    },
-
-    _computeCanLoad: function() {
-      return Boolean(!this.preventLoad && this.src);
-    },
-
-    _widthChanged: function() {
-      this.style.width = isNaN(this.width) ? this.width : this.width + 'px';
-    },
-
-    _heightChanged: function() {
-      this.style.height = isNaN(this.height) ? this.height : this.height + 'px';
-    },
-
-    _srcChanged: function(newSrc, oldSrc) {
-      if (newSrc !== oldSrc) {
-        this.loaded = false;
-      }
-    },
-
-    _placeholderBackgroundUrlChanged: function() {
-      this.$.placeholder.style.backgroundImage =
-        this._placeholderBackgroundUrl;
-    },
-
-    _transformChanged: function() {
-      var placeholderStyle = this.$.placeholder.style;
-
-      this.style.backgroundSize =
-        placeholderStyle.backgroundSize = this.sizing;
-
-      this.style.backgroundPosition =
-        placeholderStyle.backgroundPosition =
-        this.sizing ? this.position : '';
-
-      this.style.backgroundRepeat =
-        placeholderStyle.backgroundRepeat =
-        this.sizing ? 'no-repeat' : '';
-    },
-
-    _loadBehaviorChanged: function() {
-      var img;
-
-      if (!this.canLoad) {
-        return;
-      }
-
-      if (this.requiresPreload) {
-        img = new Image();
-        img.src = this.src;
-
-        this.loading = true;
-
-        img.onload = function() {
-          this.loading = false;
-          this.loaded = true;
-        }.bind(this);
-      } else {
-        this.loaded = true;
-      }
-    },
-
-    _loadStateChanged: function() {
-      if (this.requiresPreload) {
-        return;
-      }
-
-      if (this.sizing) {
-        this.style.backgroundImage = this.src ? 'url(' + this.src + ')': '';
-      } else {
-        this.$.img.src = this.src || '';
-      }
-    }
-  });
-
-</script>