Revert "Initial checkin of accessibility extensions."

ui/accessibility/extensions/highcontrast/highcontrast.js

-// Copyright (c) 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-var mode;
-var enabled = false;
-var scheme = '';
-var timeoutId = null;
-
-var filterMap = {
-  '0': 'url("#hc_extension_off")',
-  '1': 'url("#hc_extension_highcontrast")',
-  '2': 'url("#hc_extension_grayscale")',
-  '3': 'url("#hc_extension_invert")',
-  '4': 'url("#hc_extension_invert_grayscale")',
-  '5': 'url("#hc_extension_yellow_on_black")'
-};
-
-var svgContent = '<svg xmlns="http://www.w3.org/2000/svg" version="1.1"><defs><filter id="hc_extension_off"><feComponentTransfer><feFuncR type="table" tableValues="0 1"/><feFuncG type="table" tableValues="0 1"/><feFuncB type="table" tableValues="0 1"/></feComponentTransfer></filter><filter id="hc_extension_highcontrast"><feComponentTransfer><feFuncR type="gamma" exponent="3.0"/><feFuncG type="gamma" exponent="3.0"/><feFuncB type="gamma" exponent="3.0"/></feComponentTransfer></filter><filter id="hc_extension_highcontrast_back"><feComponentTransfer><feFuncR type="gamma" exponent="0.33"/><feFuncG type="gamma" exponent="0.33"/><feFuncB type="gamma" exponent="0.33"/></feComponentTransfer></filter><filter id="hc_extension_grayscale"><feColorMatrix type="matrix" values="0.2126 0.7152 0.0722 0 0 0.2126 0.7152 0.0722 0 0 0.2126 0.7152 0.0722 0 0 0 0 0 1 0"/><feComponentTransfer><feFuncR type="gamma" exponent="3"/><feFuncG type="gamma" exponent="3"/><feFuncB type="gamma" exponent="3"/></feComponentTransfer></filter><filter id="hc_extension_grayscale_back"><feComponentTransfer><feFuncR type="gamma" exponent="0.33"/><feFuncG type="gamma" exponent="0.33"/><feFuncB type="gamma" exponent="0.33"/></feComponentTransfer></filter><filter id="hc_extension_invert"><feComponentTransfer><feFuncR type="gamma" amplitude="-1" exponent="3" offset="1"/><feFuncG type="gamma" amplitude="-1" exponent="3" offset="1"/><feFuncB type="gamma" amplitude="-1" exponent="3" offset="1"/></feComponentTransfer></filter><filter id="hc_extension_invert_back"><feComponentTransfer><feFuncR type="table" tableValues="1 0"/><feFuncG type="table" tableValues="1 0"/><feFuncB type="table" tableValues="1 0"/></feComponentTransfer><feComponentTransfer><feFuncR type="gamma" exponent="1.7"/><feFuncG type="gamma" exponent="1.7"/><feFuncB type="gamma" exponent="1.7"/></feComponentTransfer></filter><filter id="hc_extension_invert_grayscale"><feColorMatrix type="matrix" values="0.2126 0.7152 0.0722 0 0 0.2126 0.7152 0.0722 0 0 0.2126 0.7152 0.0722 0 0 0 0 0 1 0"/><feComponentTransfer><feFuncR type="gamma" amplitude="-1" exponent="3" offset="1"/><feFuncG type="gamma" amplitude="-1" exponent="3" offset="1"/><feFuncB type="gamma" amplitude="-1" exponent="3" offset="1"/></feComponentTransfer></filter><filter id="hc_extension_yellow_on_black"><feComponentTransfer><feFuncR type="gamma" amplitude="-1" exponent="3" offset="1"/><feFuncG type="gamma" amplitude="-1" exponent="3" offset="1"/><feFuncB type="gamma" amplitude="-1" exponent="3" offset="1"/></feComponentTransfer><feColorMatrix type="matrix" values="0.3 0.5 0.2 0 0 0.3 0.5 0.2 0 0 0 0 0 0 0 0 0 0 1 0"/></filter><filter id="hc_extension_yellow_on_black_back"><feComponentTransfer><feFuncR type="table" tableValues="1 0"/><feFuncG type="table" tableValues="1 0"/><feFuncB type="table" tableValues="1 0"/></feComponentTransfer><feComponentTransfer><feFuncR type="gamma" exponent="0.33"/><feFuncG type="gamma" exponent="0.33"/><feFuncB type="gamma" exponent="0.33"/></feComponentTransfer></filter></defs></svg>';
-
-function addSvgIfMissing() {
-  var wrap = document.getElementById('hc_extension_svg_filters');
-  if (wrap)
-    return;
-  wrap = document.createElement('span');
-  wrap.id = 'hc_extension_svg_filters';
-  wrap.setAttribute('hidden', '');
-  wrap.innerHTML = svgContent;
-  document.body.appendChild(wrap);
-}
-
-function update() {
-  var html = document.documentElement;
-  if (enabled) {
-    if (!document.body) {
-      window.setTimeout(update, 100);
-      return;
-    }
-    addSvgIfMissing();
-    if (html.getAttribute('hc') != mode + scheme)
-      html.setAttribute('hc', mode + scheme);
-    if (html.getAttribute('hcx') != scheme)
-      html.setAttribute('hcx', scheme);
-
-    if (window == window.top) {
-      window.scrollBy(0, 1);
-      window.scrollBy(0, -1);
-    }
-
-    /**
-    if (mode == 'a') {
-      html.style.webkitFilter = filterMap[scheme];
-    }
-    else {
-      html.style.webkitFilter = 'none';
-    }**/
-
-  } else {
-    html.setAttribute('hc', mode + '0');
-    html.setAttribute('hcx', '0');
-    window.setTimeout(function() {
-      html.removeAttribute('hc');
-      html.removeAttribute('hcx');
-    }, 0);
-  }
-}
-
-function onExtensionMessage(request) {
-  if (enabled != request.enabled || scheme != request.scheme) {
-    enabled = request.enabled;
-    scheme = request.scheme;
-    update();
-  }
-}
-
-function onEvent(evt) {
-  if (evt.keyCode == 122 /* F11 */ &&
-      evt.shiftKey) {
-    chrome.extension.sendRequest({'toggle_global': true});
-    evt.stopPropagation();
-    evt.preventDefault();
-    return false;
-  }
-  if (evt.keyCode == 123 /* F12 */ &&
-      evt.shiftKey) {
-    chrome.extension.sendRequest({'toggle_site': true});
-    evt.stopPropagation();
-    evt.preventDefault();
-    return false;
-  }
-  return true;
-}
-
-function init() {
-  if (window == window.top) {
-    mode = 'a';
-  } else {
-    mode = 'b';
-  }
-  chrome.extension.onRequest.addListener(onExtensionMessage);
-  chrome.extension.sendRequest({'init': true}, onExtensionMessage);
-  document.addEventListener('keydown', onEvent, false);
-
-  // Work around bug that causes filter to be lost when the HTML element's attributes change.
-  var html = document.documentElement;
-  var config = { attributes: true, childList: false, characterData: false };
-  var observer = new MutationObserver(function(mutations) {
-    observer.disconnect();
-    html.removeAttribute('hc');
-    html.removeAttribute('hcx');
-    window.setTimeout(function() {
-      update();
-      window.setTimeout(function() {
-        observer.observe(html, config);
-      }, 0);
-    }, 0);
-  });
-  observer.observe(html, config);
-}
-
-init();