Enable PIN configuration settings.

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 d598f02f15e8582afac6462b569e41e43890def6..900dda5238847a8e52d72a77d9731d2b305eec9c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -81499,6 +81499,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-1319688939" label="ignore-gpu-blacklist"/>
   <int value="-1302904242" label="enable-navigation-tracing"/>
   <int value="-1285021473" label="save-page-as-mhtml"/>
+  <int value="-1276912933" label="enable-quick-unlock-pin"/>

[tommycli, 2016/07/21 18:46:05]

What's the purpose of these histograms?

[Dan Beam, 2016/07/21 19:07:13]

to satisfy a presubmit ;)

   <int value="-1271563519" label="enable-appcontainer"/>
   <int value="-1269084216" label="ash-md"/>
   <int value="-1268836676" label="disable-out-of-process-pdf"/>
@@ -81618,6 +81619,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-488779992" label="blink-settings"/>
   <int value="-478462945" label="enable-ephemeral-apps"/>
   <int value="-475049740" label="disable-vr-shell"/>
+  <int value="-474322576" label="disable-quick-unlock-pin"/>
   <int value="-462205750" label="enable-service-worker-sync"/>
   <int value="-455203267" label="use_new_features_summary"/>
   <int value="-430360431" label="disable-password-generation"/>