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 57632ede4126b7d0f76aab21a9a10eed619f88a0..bc1958ae1bacf926520582dc61ee2f1ec27c0bda 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -65258,6 +65258,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="322" label="Whitelist of USB detachable devices"/>
   <int value="323" label="Allow bluetooth on device"/>
   <int value="324" label="Suppress the unsupported OS warning"/>
+  <int value="325" label="Configure the automatic timezone detection method"/>
 </enum>
 
 <enum name="EnterprisePolicyInvalidations" type="int">
@@ -73171,6 +73172,7 @@ 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"/>