Bug 1498186 - Add a 'Task Manager' item opening about:performance in the 'More' section of the application menu, r=felipe.

browser/components/customizableui/content/panelUI.inc.xul

@@ -633,6 +633,10 @@
 
     <panelview id="appMenu-moreView" title="&moreMenu.label;" class="PanelUI-subView">
       <vbox class="panel-subview-body">
+        <toolbarbutton id="appMenu-taskmanager-button"
+                       class="subviewbutton subviewbutton-iconic"
+                       label="&taskManagerCmd.label;"
+                       oncommand="switchToTabHavingURI('about:performance', true)"/>
         <toolbarbutton id="appMenu-characterencoding-button"
                        class="subviewbutton subviewbutton-nav"
                        label="&charsetMenu2.label;"

browser/locales/en-US/chrome/browser/browser.dtd

@@ -121,6 +121,8 @@ when there are no windows but Firefox is still running. -->
 <!ENTITY printCmd.accesskey "P">
 <!ENTITY printCmd.commandkey "p">
 
+<!ENTITY taskManagerCmd.label "Task Manager">
+
 <!ENTITY goOfflineCmd.label "Work Offline">
 <!ENTITY goOfflineCmd.accesskey "k">
 

browser/themes/shared/icons/performance.svg

@@ -0,0 +1,7 @@
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
+  <path fill="context-fill" d="M8 1a8 8 0 0 0-8 8 7.89 7.89 0 0 0 .78 3.43 1 1 0 0 0 .9.57.94.94 0 0 0 .43-.1 1 1 0 0 0 .47-1.33A6.07 6.07 0 0 1 2 9a6 6 0 0 1 12 0 5.93 5.93 0 0 1-.59 2.57 1 1 0 0 0 1.81.86A7.89 7.89 0 0 0 16 9a8 8 0 0 0-8-8z"/>
+  <path fill="context-fill" d="M11.77 7.08a.5.5 0 0 0-.69.15L8.62 11.1A2.12 2.12 0 0 0 8 11a2 2 0 0 0 0 4 2.05 2.05 0 0 0 1.12-.34 2.31 2.31 0 0 0 .54-.54 2 2 0 0 0 0-2.24 2.31 2.31 0 0 0-.2-.24l2.46-3.87a.5.5 0 0 0-.15-.69z"/>
+</svg>

browser/themes/shared/jar.inc.mn

@@ -164,6 +164,7 @@
   skin/classic/browser/new-window.svg                 (../shared/icons/new-window.svg)
   skin/classic/browser/open.svg                       (../shared/icons/open.svg)
   skin/classic/browser/page-action.svg                (../shared/icons/page-action.svg)
+  skin/classic/browser/performance.svg                (../shared/icons/performance.svg)
   skin/classic/browser/print.svg                      (../shared/icons/print.svg)
   skin/classic/browser/private-browsing.svg           (../shared/icons/private-browsing.svg)
   skin/classic/browser/privateBrowsing.svg            (../shared/icons/privateBrowsing.svg)

browser/themes/shared/menupanel.inc.css

@@ -33,6 +33,10 @@
   list-style-image: url(chrome://browser/skin/search-glass.svg);
 }
 
+#appMenu-taskmanager-button {
+  list-style-image: url("chrome://browser/skin/performance.svg");
+}
+
 #appMenu-help-button {
   list-style-image: url(chrome://global/skin/icons/help.svg);
 }