Add an about:flags entry for CSS Regions.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 5125 matching lines @@
       <message name="IDS_FLAGS_ENABLE_JAVASCRIPT_HARMONY_DESCRIPTION" desc="Description for the flag to enable JavaScript Harmony features.">
         Enable web pages to use experimental JavaScript features.
       </message>
       <message name="IDS_FLAGS_ENABLE_TAB_BROWSER_DRAGGING_NAME" desc="Title for the flag to enable detached tabs to create a real browser.">
         Enable Tab Browser Dragging
       </message>
       <message name="IDS_FLAGS_ENABLE_TAB_BROWSER_DRAGGING_DESCRIPTION" desc="Description for the flag to enable detached tabs to create a real browser.">
         Enable creating a browser window when dragging tabs.
       </message>
       <message name="IDS_FLAGS_DISABLE_RESTORE_SESSION_STATE_NAME" desc="Title for the flag to disable restoring (more) session state after restarts and crashes.">
-        Disable Better session restore
+        Disable Better session restore
       </message>
       <message name="IDS_FLAGS_DISABLE_RESTORE_SESSION_STATE_DESCRIPTION" desc="Description for the flag to disable restoring (more) session state after restarts and crashes.">
-        Disables the Better session restore features which restore more session state (e.g., session cookies) after restarts and crashes.
+        Disables the Better session restore features which restore more session state (e.g., session cookies) after restarts and crashes.
       </message>
       <message name="IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_NAME" desc="Title for the flag to disable using a software rasterizer.">
-        Disable 3D software rasterizer
+        Disable 3D software rasterizer
       </message>
       <message name="IDS_FLAGS_DISABLE_SOFTWARE_RASTERIZER_DESCRIPTION" desc="Description for the flag to disable using a software renderer.">
-        Don't fall back to a 3D software rasterizer when the GPU cannot be used.
+        Don't fall back to a 3D software rasterizer when the GPU cannot be used.
       </message>
       <message name="IDS_FLAGS_MEDIA_STREAM_NAME" desc="Name for the flag to enable MediaStream, GetUserMedia and PeerConnection.">
         Enable MediaStream.
       </message>
       <message name="IDS_FLAGS_MEDIA_STREAM_DESCRIPTION" desc="Description for the flag to enable MediaStream, GetUserMedia and PeerConnection.">
         Enable MediaStream, GetUserMedia, and PeerConnection APIs for WebRTC functionality. More info at webrtc.org.
       </message>
       <message name="IDS_FLAGS_SHADOW_DOM_NAME" desc="Name for the flag to enable Shadow DOM.">
         Enable Shadow DOM.
       </message>
       <message name="IDS_FLAGS_SHADOW_DOM_DESCRIPTION" desc="Description for the flag to enable Shadow DOM.">
         This API allows web applications to use Web Components.
       </message>
       <message name="IDS_FLAGS_STYLE_SCOPED_NAME" desc="Name for the flag to enable &lt;style scoped&gt;.">
         Enable &lt;style scoped&gt;.
       </message>
       <message name="IDS_FLAGS_STYLE_SCOPED_DESCRIPTION" desc="Description for the flag to enable &lt;style scoped&gt;.">
         Honor the 'scoped' attribute in &amp;lt;style&amp;gt; elements.
       </message>
+      <message name="IDS_FLAGS_CSS_REGIONS_NAME" desc="Name for the flag to enable CSS Regions.">
+        Enable CSS Regions.
+      </message>
+      <message name="IDS_FLAGS_CSS_REGIONS_DESCRIPTION" desc="Description for the flag to enable CSS Regions.">
+        Enable CSS Regions.
+      </message>
       <message name="IDS_FLAGS_WEBUI_TASK_MANAGER_NAME" desc="Title for the flag to use the WebUI task manager.">
         Enable experimental task manager.
       </message>
       <message name="IDS_FLAGS_WEBUI_TASK_MANAGER_DESCRIPTION" desc="Description for the flag to use the WebUI task manager.">
         Enable experimental HTML implementation of the task manager dialog.
       </message>
       <message name="IDS_FLAGS_APP_INSTALL_HINT_NAME" desc="Name for the flag to show the app install hint on the NTP.">
         NTP App Install Hint
       </message>
       <message name="IDS_FLAGS_APP_INSTALL_HINT_DESCRIPTION" desc="Description for the flag to show the app install hint on the NTP.">
@@ skipping 9954 matching lines @@
     </messages>
     <structures fallback_to_english="true">
       <!-- Make sure these stay in sync with the structures in generated_resources.grd. -->
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
   </release>
 </grit>