Use a Finch Experiment to control the Browser Blacklist

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 c63891fb76ecacfc4851cb2c32196e7bb638dbb4..10daa7b13952cd9dce83eb2884e4769e0ab02742 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -1268,6 +1268,14 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Blacklist.Setup" enum="BlacklistSetup">
+  <summary>
+    Records the successes and failures when running the browser blacklist setup
+    code. Used to determine if the blacklist is working as intended (since the
+    blacklist runs before crash reporting is set up).
+  </summary>
+</histogram>
+
 <histogram name="Bluetooth.ConnectedDeviceCount" units="devices">
   <summary>
     Counts the number of simulataneously connected Bluetooth devices. Used to
@@ -22065,6 +22073,12 @@ other types of suffix sets.
   <int value="2" label="Bad"/>
 </enum>
 
+<enum name="BlacklistSetup" type="int">
+  <int value="0" label="Blacklist enabled"/>
+  <int value="1" label="Blacklist ran successfully."/>
+  <int value="2" label="Blacklist failed."/>
+</enum>
+
 <enum name="BluetoothPairingMethod" type="int">
   <int value="0" label="No user interaction required"/>
   <int value="1" label="PIN Code requested from user"/>