chromeos: Add settings to control power management prefs.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Main Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_SECONDARY_USER_BANNER" desc="Banner displayed in settings page when the user is secondary in a multi-profile session.">
       Some settings belonging to <ph name="PRIMARY_EMAIL">$1<ex>john@google.com</ex></ph> are being shared with you. These settings only affect your account when using multiple sign-in.
     </message>
   </if>
 
@@ skipping 3131 matching lines @@
     </message>
     <message name="IDS_SETTINGS_POWER_SOURCE_AC_ADAPTER" desc="In Device Settings > Power, the text referring to a dedicated charger like an AC adapter as the power source.">
       AC adapter
     </message>
     <message name="IDS_SETTINGS_POWER_SOURCE_LOW_POWER_CHARGER" desc="In Device Settings > Power, the text referring to a low-power charger like a USB charger as the power source.">
       Low-power charger
     </message>
     <message name="IDS_SETTINGS_POWER_SOURCE_CALCULATING" desc="In Device Settings > Power, the power source description when the power status is being determined.">
       Checking...
     </message>
+    <message name="IDS_SETTINGS_POWER_IDLE_LABEL" desc="In Device Settings > Power, label for idle behavior.">

[michaelpg, 2017/06/16 01:34:59]

"label for behavior when device is idle" to reduce likelihood of clarification
question from translators

[Daniel Erat, 2017/06/16 02:34:24]

Done.

+      When idle
+    </message>
+    <message name="IDS_SETTINGS_POWER_IDLE_DISPLAY_OFF_SLEEP" desc="In Device Settings > Power, menu item for idle behavior that turns the screen off and later puts the device to sleep.">
+      Turn off display and sleep
+    </message>
+    <message name="IDS_SETTINGS_POWER_IDLE_DISPLAY_OFF_STAY_AWAKE" desc="In Device Settings > Power, menu item for idle behavior that turns the screen off but prevents the device from sleeping.">
+      Turn off display but stay awake
+    </message>
+    <message name="IDS_SETTINGS_POWER_IDLE_DISPLAY_ON" desc="In Device Settings > Power, menu item for idle behavior that prevents the screen from turning off and prevents the device from sleeping.">
+      Keep display on
+    </message>
+    <message name="IDS_SETTINGS_POWER_IDLE_OTHER" desc="In Device Settings > Power, menu item for custom idle behavior.">
+      Other
+    </message>
+    <message name="IDS_SETTINGS_POWER_LID_CLOSED_LABEL" desc="In Device Settings > Power, label for lid-closed behavior.">
+      When lid is closed
+    </message>
+    <message name="IDS_SETTINGS_POWER_LID_CLOSED_SLEEP" desc="In Device Settings > Power, menu item for lid-closed behavior that puts the device to sleep.">
+      Sleep
+    </message>
+    <message name="IDS_SETTINGS_POWER_LID_CLOSED_STAY_AWAKE" desc="In Device Settings > Power, menu item for lid-closed behavior that prevents the device from sleeping.">
+      Stay awake
+    </message>
+    <message name="IDS_SETTINGS_POWER_LID_CLOSED_SIGN_OUT" desc="In Device Settings > Power, menu item for lid-closed behavior that signs the user out.">
+      Sign out
+    </message>
+    <message name="IDS_SETTINGS_POWER_LID_CLOSED_SHUT_DOWN" desc="In Device Settings > Power, menu item for lid-closed behavior that shuts the system down.">
+      Shut down
+    </message>
   </if>
 
   <!-- System Page -->
   <if expr="not chromeos">
     <message name="IDS_SETTINGS_SYSTEM" desc="Title of the system settings.">
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_LABEL" desc="Label for the control that opens a user's network proxy settings.">
       Open proxy settings
     </message>
   </if>
 </grit-part>