MD Settings: About page, implementing channel switcher dialog.

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index c7d4e772952ccabfc524a61f00ab3d176a76bca4..42220d73e2954de1599500e4fa160a6086a10320 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -39,6 +39,32 @@
     <message name="IDS_SETTINGS_UPGRADE_UP_TO_DATE" desc="Status label: Already up to date (ChromiumOS/ChromeOS)">
       Your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> is up to date.
     </message>
+
+    <!-- About Page: Channel switcher dialog -->
+    <message name="IDS_SETTINGS_ABOUT_PAGE_CHANGE_CHANNEL" desc="Button label for channel switch.">
+      Change channel
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_CHANGE_CHANNEL_AND_POWERWASH" desc="Button label for channel switch and powerwash.">
+      Change channel and Powerwash
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_DELAYED_WARNING_MESSAGE" desc="Message that notifies user that channel change will be applied later.">
+      You are changing to a channel with an older version of <ph name="PRODUCT_NAME">$1<ex>Chrome OS</ex></ph>. The channel change will be applied when the channel version matches the version currently installed on your device.
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_DELAYED_WARNING_TITLE" desc="Title for the message that the channel change will be applied later.">
+      Channel change will be applied later.
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_POWERWASH_WARNING_MESSAGE" desc="Message that warns user about powerwash.">
+      This will remove all local users, files, data, and other settings after your next restart. All users will need to sign in again.
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_POWERWASH_WARNING_TITLE" desc="The title for the message that warns user about powerwash.">
+      Powerwash required on next reboot
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_UNSTABLE_WARNING_MESSAGE" desc="Warning about switching to developer (unstable) channel.">
+      You are updating to an unstable version of <ph name="PRODUCT_NAME">$1<ex>Chrome OS</ex></ph> which contains features that are in progress. Crashes and unexpected bugs will occur. Please proceed with caution.
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_UNSTABLE_WARNING_TITLE" desc="The title of the warning about switching to developer (unstable) channel.">
+      Warning: you are switching to developer channel
+    </message>
   </if>
   <if expr="not chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_RELAUNCH" desc="The label for the relaunch button that relaunches the browser once update is complete">