ChromeOS: Add SystemTimezoneAutomaticDetection policy.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 6ccda4ae0646923eb4caf7dae26d58d9ac85280b..eeb33c407f4ebc466c5c9ea1d304f9551ee7e13a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -65042,6 +65042,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="321" label="Configure the login authentication behavior"/>
   <int value="322" label="Whitelist of USB detachable devices"/>
   <int value="323" label="Allow bluetooth on device"/>
+  <int value="324" label="Configure the automatic timezone detection method"/>
 </enum>
 
 <enum name="EnterprisePolicyInvalidations" type="int">
@@ -72949,6 +72950,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-2063014275" label="enable-web-bluetooth"/>
   <int value="-2062872298" label="market-url-for-testing"/>
   <int value="-2048732429" label="enable-alternative-services"/>
+  <int value="-2047832738" label="enable-system-timezone-automatic-detection"/>
   <int value="-2047822258" label="enable-avfoundation"/>
   <int value="-2043128632" label="enable-tab-switcher-in-document-mode"/>
   <int value="-2025367104" label="enable-material-design-ntp"/>