Index: src/wp-includes/js/wp-hooks.js
===================================================================
--- src/wp-includes/js/wp-hooks.js	(nonexistent)
+++ src/wp-includes/js/wp-hooks.js	(working copy)
@@ -0,0 +1,257 @@
+( function( window, undefined ) {
+	'use strict';
+
+	/**
+	 * Handles managing all events for whatever you plug it into. Priorities for hooks are based on lowest to highest in
+	 * that, lowest priority hooks are fired first.
+	 */
+	var EventManager = function() {
+		var slice = Array.prototype.slice;
+
+		/**
+		 * Maintain a reference to the object scope so our public methods never get confusing.
+		 */
+		var MethodsAvailable;
+
+		/**
+		 * Contains the hooks that get registered with this EventManager. The array for storage utilizes a "flat"
+		 * object literal such that looking up the hook utilizes the native object literal hash.
+		 */
+		var STORAGE = {
+			actions : {},
+			filters : {}
+		};
+
+		/**
+		 * Adds an action to the event manager.
+		 *
+		 * @param {string}   action         The action to perform.
+		 * @param {Function} callback       Must be a valid callback function before this action is added
+		 * @param {number}   [priority=10]  Controls when the function is executed in relation to other callbacks bound
+		 *                                  to the same hook. Optional, defaults to 10.
+		 * @param {Object}   [context=this] The context to bind when executing the callback.Optionsl, defaults to `this`.
+		 */
+		function addAction( action, callback, priority, context ) {
+			if ( typeof action === 'string' && typeof callback === 'function' ) {
+				priority = parseInt( ( priority || 10 ), 10 );
+				_addHook( 'actions', action, callback, priority, context || this );
+			}
+
+			return MethodsAvailable;
+		}
+
+		/**
+		 * Performs an action if it exists. You can pass as many arguments as you want to this function.
+		 * The only rule is that the first argument must always be the action.
+		 *
+		 * @param {string} action The action to perform.
+		 * @param {...*}   args   Optional args to pass to the action.
+		 */
+		function doAction( /* action, arg1, arg2, ... */ ) {
+			var args = slice.call( arguments );
+			var action = args.shift();
+
+			if ( typeof action === 'string' ) {
+				_runHook( 'actions', action, args );
+			}
+
+			return MethodsAvailable;
+		}
+
+		/**
+		 * Removes the specified action if it exists.
+		 *
+		 * @param {string}   action     The action to remove.
+		 * @param {Function} [callback] Callback function to remove. Optional.
+		 */
+		function removeAction( action, callback ) {
+			if ( typeof action === 'string' ) {
+				_removeHook( 'actions', action, callback );
+			}
+
+			return MethodsAvailable;
+		}
+
+		/**
+		 * Adds a filter to the event manager.
+		 *
+		 * @param {string} filter     The filter to add.
+		 * @param {Function} callback The function to call with this filter.
+		 * @param [priority=10] Used to control when the function is executed in relation to other callbacks bound to the same hook
+		 * @param [context] Supply a value to be used for this
+		 */
+		function addFilter( filter, callback, priority, context ) {
+			if ( typeof filter === 'string' && typeof callback === 'function' ) {
+				priority = parseInt( ( priority || 10 ), 10 );
+				_addHook( 'filters', filter, callback, priority, context );
+			}
+
+			return MethodsAvailable;
+		}
+
+		/**
+		 * Performs a filter if it exists. You should only ever pass 1 argument to be filtered.
+		 * The only rule is that the first argument must always be the filter.
+		 *
+		 * @param {string} action The action to perform.
+		 * @param {...*}   args   Optional args to pass to the action.
+		 */
+		function applyFilters( /* filter, filtered arg, arg2, ... */ ) {
+			var args = slice.call( arguments );
+			var filter = args.shift();
+
+			if ( typeof filter === 'string' ) {
+				return _runHook( 'filters', filter, args );
+			}
+
+			return MethodsAvailable;
+		}
+
+		/**
+		 * Removes the specified filter if it contains a namespace.identifier & exists.
+		 *
+		 * @param {string} filter The action to remove.
+		 * @param [callback]      Callback function to remove. Optional.
+		 */
+		function removeFilter( filter, callback ) {
+			if ( typeof filter === 'string') {
+				_removeHook( 'filters', filter, callback );
+			}
+
+			return MethodsAvailable;
+		}
+
+		/**
+		 * Removes the specified hook by resetting the value of it.
+		 *
+		 * @param {string} type Type of hook, either 'actions' or 'filters'.
+		 * @param {string} hook The hook (namespace.identifier) to remove.
+		 * @private
+		 */
+		function _removeHook( type, hook, callback ) {
+			var handlers, handler, i;
+
+			if ( !STORAGE[ type ][ hook ] ) {
+				return;
+			}
+			if ( !callback ) {
+				STORAGE[ type ][ hook ] = [];
+			} else {
+				handlers = STORAGE[ type ][ hook ];
+				if ( !context ) {
+					for ( i = handlers.length; i--; ) {
+						if ( handlers[i].callback === callback ) {
+							handlers.splice( i, 1 );
+						}
+					}
+				}
+				else {
+					for ( i = handlers.length; i--; ) {
+						handler = handlers[i];
+						if ( handler.callback === callback ) {
+							handlers.splice( i, 1 );
+						}
+					}
+				}
+			}
+		}
+
+		/**
+		 * Adds the hook to the appropriate storage container
+		 *
+		 * @param {string}   type      The hook type: 'actions' or 'filters'
+		 * @param {string}   hook      The hook (namespace.identifier) to add to our event manager
+		 * @param {function} callback  The function that will be called when the hook is executed.
+		 * @param {number}   priority  The priority of this hook. Must be an integer.
+		 * @param {mixed}    [context] A value to be used for `this`. Optional.
+		 * @private
+		 */
+		function _addHook( type, hook, callback, priority, context ) {
+			var hookObject = {
+				callback : callback,
+				priority : priority,
+				context : context
+			};
+
+			// Utilize 'prop itself' : http://jsperf.com/hasownproperty-vs-in-vs-undefined/19
+			var hooks = STORAGE[ type ][ hook ];
+			if ( hooks ) {
+				hooks.push( hookObject );
+				hooks = _hookInsertSort( hooks );
+			}
+			else {
+				hooks = [ hookObject ];
+			}
+
+			STORAGE[ type ][ hook ] = hooks;
+		}
+
+		/**
+		 * Use an insert sort for keeping our hooks organized based on priority.
+		 * This function is ridiculously faster than bubble sort, etc: http://jsperf.com/javascript-sort
+		 *
+		 * @param {array} hooks The custom array containing all of the appropriate hooks to perform an insert sort on.
+		 * @private
+		 */
+		function _hookInsertSort( hooks ) {
+			var tmpHook, j, prevHook;
+			for( var i = 1, len = hooks.length; i < len; i++ ) {
+				tmpHook = hooks[ i ];
+				j = i;
+				while( ( prevHook = hooks[ j - 1 ] ) &&  prevHook.priority > tmpHook.priority ) {
+					hooks[ j ] = hooks[ j - 1 ];
+					--j;
+				}
+				hooks[ j ] = tmpHook;
+			}
+
+			return hooks;
+		}
+
+		/**
+		 * Runs the specified hook. If it is an action, the value is not modified but if it is a filter, it is.
+		 *
+		 * @param {string} type 'actions' or 'filters'
+		 * @param {string} hook The hook to run.
+		 * @param {...*}   args Arguments to pass to the action/filter.
+		 * @private
+		 */
+		function _runHook( type, hook, args ) {
+			var handlers = STORAGE[ type ][ hook ], i, len;
+
+			if ( ! handlers ) {
+				return ( type === 'filters' ) ? args[0] : false;
+			}
+
+			len = handlers.length;
+			if ( type === 'filters' ) {
+				for ( i = 0; i < len; i++ ) {
+					args[ 0 ] = handlers[ i ].callback.apply( handlers[ i ].context, args );
+				}
+			} else {
+				for ( i = 0; i < len; i++ ) {
+					handlers[ i ].callback.apply( handlers[ i ].context, args );
+				}
+			}
+
+			return ( type === 'filters' ) ? args[ 0 ] : true;
+		}
+
+		// return all of the publicly available methods
+		return MethodsAvailable;
+
+	};
+
+	window.wp = window.wp || {};
+	window.wp.hooks = new EventManager();
+
+	MethodsAvailable = {
+		removeFilter : removeFilter,
+		applyFilters : applyFilters,
+		addFilter : addFilter,
+		removeAction : removeAction,
+		doAction : doAction,
+		addAction : addAction
+	};
+
+} )( window );
Index: src/wp-includes/script-loader.php
===================================================================
--- src/wp-includes/script-loader.php	(revision 39544)
+++ src/wp-includes/script-loader.php	(working copy)
@@ -85,6 +85,8 @@
 
 	$scripts->add( 'wp-a11y', "/wp-includes/js/wp-a11y$suffix.js", array( 'jquery' ), false, 1 );
 
+	$scripts->add( 'wp-hooks', "/wp-includes/js/wp-hooks$suffix.js", array(), false, 1 );
+
 	$scripts->add( 'sack', "/wp-includes/js/tw-sack$suffix.js", array(), '1.6.1', 1 );
 
 	$scripts->add( 'quicktags', "/wp-includes/js/quicktags$suffix.js", array(), false, 1 );