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diff --git a/wp-includes/js/customize-models.js b/wp-includes/js/customize-models.js
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+/**
+ * @output wp-includes/js/customize-models.js
+ */
+
+/* global _wpCustomizeHeader */
+(function( $, wp ) {
+	var api = wp.customize;
+	/** @namespace wp.customize.HeaderTool */
+	api.HeaderTool = {};
+
+
+	/**
+	 * wp.customize.HeaderTool.ImageModel
+	 *
+	 * A header image. This is where saves via the Customizer API are
+	 * abstracted away, plus our own Ajax calls to add images to and remove
+	 * images from the user's recently uploaded images setting on the server.
+	 * These calls are made regardless of whether the user actually saves new
+	 * Customizer settings.
+	 *
+	 * @memberOf wp.customize.HeaderTool
+	 * @alias wp.customize.HeaderTool.ImageModel
+	 *
+	 * @constructor
+	 * @augments Backbone.Model
+	 */
+	api.HeaderTool.ImageModel = Backbone.Model.extend(/** @lends wp.customize.HeaderTool.ImageModel.prototype */{
+		defaults: function() {
+			return {
+				header: {
+					attachment_id: 0,
+					url: '',
+					timestamp: _.now(),
+					thumbnail_url: ''
+				},
+				choice: '',
+				selected: false,
+				random: false
+			};
+		},
+
+		initialize: function() {
+			this.on('hide', this.hide, this);
+		},
+
+		hide: function() {
+			this.set('choice', '');
+			api('header_image').set('remove-header');
+			api('header_image_data').set('remove-header');
+		},
+
+		destroy: function() {
+			var data = this.get('header'),
+				curr = api.HeaderTool.currentHeader.get('header').attachment_id;
+
+			// If the image we're removing is also the current header,
+			// unset the latter.
+			if (curr && data.attachment_id === curr) {
+				api.HeaderTool.currentHeader.trigger('hide');
+			}
+
+			wp.ajax.post( 'custom-header-remove', {
+				nonce: _wpCustomizeHeader.nonces.remove,
+				wp_customize: 'on',
+				theme: api.settings.theme.stylesheet,
+				attachment_id: data.attachment_id
+			});
+
+			this.trigger('destroy', this, this.collection);
+		},
+
+		save: function() {
+			if (this.get('random')) {
+				api('header_image').set(this.get('header').random);
+				api('header_image_data').set(this.get('header').random);
+			} else {
+				if (this.get('header').defaultName) {
+					api('header_image').set(this.get('header').url);
+					api('header_image_data').set(this.get('header').defaultName);
+				} else {
+					api('header_image').set(this.get('header').url);
+					api('header_image_data').set(this.get('header'));
+				}
+			}
+
+			api.HeaderTool.combinedList.trigger('control:setImage', this);
+		},
+
+		importImage: function() {
+			var data = this.get('header');
+			if (data.attachment_id === undefined) {
+				return;
+			}
+
+			wp.ajax.post( 'custom-header-add', {
+				nonce: _wpCustomizeHeader.nonces.add,
+				wp_customize: 'on',
+				theme: api.settings.theme.stylesheet,
+				attachment_id: data.attachment_id
+			} );
+		},
+
+		shouldBeCropped: function() {
+			if (this.get('themeFlexWidth') === true &&
+						this.get('themeFlexHeight') === true) {
+				return false;
+			}
+
+			if (this.get('themeFlexWidth') === true &&
+				this.get('themeHeight') === this.get('imageHeight')) {
+				return false;
+			}
+
+			if (this.get('themeFlexHeight') === true &&
+				this.get('themeWidth') === this.get('imageWidth')) {
+				return false;
+			}
+
+			if (this.get('themeWidth') === this.get('imageWidth') &&
+				this.get('themeHeight') === this.get('imageHeight')) {
+				return false;
+			}
+
+			if (this.get('imageWidth') <= this.get('themeWidth')) {
+				return false;
+			}
+
+			return true;
+		}
+	});
+
+
+	/**
+	 * wp.customize.HeaderTool.ChoiceList
+	 *
+	 * @memberOf wp.customize.HeaderTool
+	 * @alias wp.customize.HeaderTool.ChoiceList
+	 *
+	 * @constructor
+	 * @augments Backbone.Collection
+	 */
+	api.HeaderTool.ChoiceList = Backbone.Collection.extend({
+		model: api.HeaderTool.ImageModel,
+
+		// Ordered from most recently used to least.
+		comparator: function(model) {
+			return -model.get('header').timestamp;
+		},
+
+		initialize: function() {
+			var current = api.HeaderTool.currentHeader.get('choice').replace(/^https?:\/\//, ''),
+				isRandom = this.isRandomChoice(api.get().header_image);
+
+			// Overridable by an extending class.
+			if (!this.type) {
+				this.type = 'uploaded';
+			}
+
+			// Overridable by an extending class.
+			if (typeof this.data === 'undefined') {
+				this.data = _wpCustomizeHeader.uploads;
+			}
+
+			if (isRandom) {
+				// So that when adding data we don't hide regular images.
+				current = api.get().header_image;
+			}
+
+			this.on('control:setImage', this.setImage, this);
+			this.on('control:removeImage', this.removeImage, this);
+			this.on('add', this.maybeRemoveOldCrop, this);
+			this.on('add', this.maybeAddRandomChoice, this);
+
+			_.each(this.data, function(elt, index) {
+				if (!elt.attachment_id) {
+					elt.defaultName = index;
+				}
+
+				if (typeof elt.timestamp === 'undefined') {
+					elt.timestamp = 0;
+				}
+
+				this.add({
+					header: elt,
+					choice: elt.url.split('/').pop(),
+					selected: current === elt.url.replace(/^https?:\/\//, '')
+				}, { silent: true });
+			}, this);
+
+			if (this.size() > 0) {
+				this.addRandomChoice(current);
+			}
+		},
+
+		maybeRemoveOldCrop: function( model ) {
+			var newID = model.get( 'header' ).attachment_id || false,
+			 	oldCrop;
+
+			// Bail early if we don't have a new attachment ID.
+			if ( ! newID ) {
+				return;
+			}
+
+			oldCrop = this.find( function( item ) {
+				return ( item.cid !== model.cid && item.get( 'header' ).attachment_id === newID );
+			} );
+
+			// If we found an old crop, remove it from the collection.
+			if ( oldCrop ) {
+				this.remove( oldCrop );
+			}
+		},
+
+		maybeAddRandomChoice: function() {
+			if (this.size() === 1) {
+				this.addRandomChoice();
+			}
+		},
+
+		addRandomChoice: function(initialChoice) {
+			var isRandomSameType = RegExp(this.type).test(initialChoice),
+				randomChoice = 'random-' + this.type + '-image';
+
+			this.add({
+				header: {
+					timestamp: 0,
+					random: randomChoice,
+					width: 245,
+					height: 41
+				},
+				choice: randomChoice,
+				random: true,
+				selected: isRandomSameType
+			});
+		},
+
+		isRandomChoice: function(choice) {
+			return (/^random-(uploaded|default)-image$/).test(choice);
+		},
+
+		shouldHideTitle: function() {
+			return this.size() < 2;
+		},
+
+		setImage: function(model) {
+			this.each(function(m) {
+				m.set('selected', false);
+			});
+
+			if (model) {
+				model.set('selected', true);
+			}
+		},
+
+		removeImage: function() {
+			this.each(function(m) {
+				m.set('selected', false);
+			});
+		}
+	});
+
+
+	/**
+	 * wp.customize.HeaderTool.DefaultsList
+	 *
+	 * @memberOf wp.customize.HeaderTool
+	 * @alias wp.customize.HeaderTool.DefaultsList
+	 *
+	 * @constructor
+	 * @augments wp.customize.HeaderTool.ChoiceList
+	 * @augments Backbone.Collection
+	 */
+	api.HeaderTool.DefaultsList = api.HeaderTool.ChoiceList.extend({
+		initialize: function() {
+			this.type = 'default';
+			this.data = _wpCustomizeHeader.defaults;
+			api.HeaderTool.ChoiceList.prototype.initialize.apply(this);
+		}
+	});
+
+})( jQuery, window.wp );