Add a triggered profile reset mechanism.

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 aa44430b34ea4becc99aa7f430e441924ec69b2f..f97afeea134cc80c5a5be277c0ad0118e5e898e9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -35260,6 +35260,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Total size of the profile data (excluding sub-folders).</summary>
 </histogram>
 
+<histogram name="Profile.TriggeredReset" enum="BooleanReset">
+  <owner>robertshield@chromium.org</owner>
+  <summary>
+    Indicates whether a profile had a reset trigger that caused it to launch a
+    reset flow. The presence of this trigger is recorded during profile
+    creation.
+  </summary>
+</histogram>
+
 <histogram name="Profile.Update" enum="ProfileType">
   <owner>rlp@chromium.org</owner>
   <summary>Times a profile name and/or avatar was updated.</summary>
@@ -54048,6 +54057,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Reported"/>
 </enum>
 
+<enum name="BooleanReset" type="int">
+  <int value="0" label="Not reset"/>
+  <int value="1" label="Reset"/>
+</enum>
+
 <enum name="BooleanReused" type="int">
   <int value="0" label="Not Reused"/>
   <int value="1" label="Reused"/>