Bug 1482256 - Support switching to browser.xul to browser.xhtml. r=mossop

Adds a new environment variable MOZ_BROWSER_XHTML to change Firefox to load
a modified version of browser.xul as browser.xhtml. Adds the xhtml
namespace to the script tags to make them work.

MozReview-Commit-ID: 2adtOVzXHKd

browser/base/content/browser.xhtml

@@ -0,0 +1,3 @@
+#define BROWSER_XHTML
+#include browser.xul
+#undef BROWSER_XHTML

browser/base/content/browser.xul

@@ -72,7 +72,11 @@
 # that they can be shared with macWindow.inc.xul.
 #include global-scripts.inc
 
-<script type="application/javascript">
+<script type="application/javascript"
+#ifdef BROWSER_XHTML
+xmlns="http://www.w3.org/1999/xhtml"
+#endif
+>
   Services.scriptloader.loadSubScript("chrome://global/content/contentAreaUtils.js", this);
   Services.scriptloader.loadSubScript("chrome://browser/content/tabbrowser.js", this);
 </script>

browser/base/content/global-scripts.inc

@@ -7,7 +7,11 @@
 # file so that ESLint works correctly:
 # tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js
 
-<script type="application/javascript">
+<script type="text/javascript"
+#ifdef BROWSER_XHTML
+xmlns="http://www.w3.org/1999/xhtml"
+#endif
+>
 Components.utils.import("resource://gre/modules/Services.jsm");
 
 for (let script of [

browser/base/jar.mn

@@ -29,6 +29,9 @@ browser.jar:
         content/browser/aboutTabCrashed.xhtml         (content/aboutTabCrashed.xhtml)
 *       content/browser/browser.css                   (content/browser.css)
         content/browser/browser.js                    (content/browser.js)
+#ifdef MOZ_BROWSER_XHTML
+*       content/browser/browser.xhtml                 (content/browser.xhtml)
+#endif
 *       content/browser/browser.xul                   (content/browser.xul)
         content/browser/browser-addons.js             (content/browser-addons.js)
         content/browser/browser-allTabsMenu.js        (content/browser-allTabsMenu.js)

browser/base/moz.build

@@ -62,6 +62,7 @@ BROWSER_CHROME_MANIFESTS += [
 
 DEFINES['MOZ_APP_VERSION'] = CONFIG['MOZ_APP_VERSION']
 DEFINES['MOZ_APP_VERSION_DISPLAY'] = CONFIG['MOZ_APP_VERSION_DISPLAY']
+DEFINES['MOZ_BROWSER_XHTML'] = CONFIG['MOZ_BROWSER_XHTML']
 
 DEFINES['APP_LICENSE_BLOCK'] = '%s/content/overrides/app-license.html' % SRCDIR
 

browser/confvars.sh

@@ -40,7 +40,11 @@ MOZ_ENABLE_SIGNMAR=1
 MOZ_APP_VERSION=$FIREFOX_VERSION
 MOZ_APP_VERSION_DISPLAY=$FIREFOX_VERSION_DISPLAY
 
-BROWSER_CHROME_URL=chrome://browser/content/browser.xul
+if [ "${MOZ_BROWSER_XHTML}" = "1" ]; then
+  BROWSER_CHROME_URL=chrome://browser/content/browser.xhtml
+else
+  BROWSER_CHROME_URL=chrome://browser/content/browser.xul
+fi
 
 # MOZ_APP_DISPLAYNAME will be set by branding/configure.sh
 # MOZ_BRANDING_DIRECTORY is the default branding directory used when none is

toolkit/content/editMenuCommands.inc.xul

@@ -1,4 +1,8 @@
-<script type="application/javascript" src="chrome://global/content/editMenuOverlay.js"/>
+<script type="application/javascript" src="chrome://global/content/editMenuOverlay.js"
+#ifdef BROWSER_XHTML
+xmlns="http://www.w3.org/1999/xhtml"
+#endif
+/>
 <commandset id="editMenuCommands">
   <commandset id="editMenuCommandSetAll" commandupdater="true" events="focus,select"
               oncommandupdate="goUpdateGlobalEditMenuItems()"/>