Settings reset prompt: add more UI metrics.

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 6d44207e6e96ff7139d74918ae1f28d77c0127c6..9ecbd826add922f05b7272a7e415c2f0cacecfc4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -65586,7 +65586,20 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="SettingsResetPrompt.TimeUntilCanceled" units="ms">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    The time between the settings reset prompt dialog being shown and the user
+    declining the prompt by clicking the cancel button.
+  </summary>
+</histogram>
+
 <histogram name="SettingsResetPrompt.TimeUntilDeclined" units="ms">
+  <obsolete>
+    Deprecated in M59 in April 2017 and replaced by
+    SettingsResetPrompt.TimeUntilCanceled and
+    SettingsResetPrompt.TimeUntilDismissed.
+  </obsolete>
   <owner>alito@chromium.org</owner>
   <summary>
     The time between the settings reset prompt dialog being shown and the user
@@ -65594,6 +65607,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="SettingsResetPrompt.TimeUntilDismissed" units="ms">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    The time between the settings reset prompt dialog being shown and the user
+    dismissing the prompt, for example by clicking on the 'x' in the dialog or
+    pressing the Escape key.
+  </summary>
+</histogram>
+
 <histogram name="Setup.Install.ApplyArchivePatchTime" units="ms">
   <owner>grt@chromium.org</owner>
   <summary>