Settings reset prompt: add UMA metrics reporting.

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 da1f11b7838f7d0f76258be3bb670165f79d7615..642ec813e78796b181fca3f29fd8af4633c71081 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -64126,6 +64126,89 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="SettingsResetPrompt.DelayBeforePromptParam" units="seconds">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    The feature parameter determining the amount of time to wait after startup
+    before attempting to show the settings reset prompt. Logged once after
+    startup.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.DialogShown" enum="BooleanShown">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    Indicates whether the settings reset prompt dialog was shown to the user.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.NumberOfExtensionsDisabled"
+    units="extensions">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    The number of extensions that were disabled after the user accepted the
+    settings reset prompt.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.NumberOfExtensionsToDisable"
+    units="extensions">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    The number of extensions that will be disabled if the user accepts the
+    settings reset prompt. Logged once after startup.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.PromptAccepted" enum="BooleanAccepted">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    Indicates whether the user accepted the settings reset prompt.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.PromptRequired" enum="BooleanRequired">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    Indicates whether the settings reset prompt should be shown to the user
+    based on the state of the user's settings.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.ResetState"
+    enum="SettingsResetPromptResetState">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    Indicates whether the settings reset prompt is enabled for the user's
+    setting, or the reason for it being disabled. Logged once after startup.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.SettingsReset"
+    enum="SettingsResetPromptSettingsReset">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    Indicates which settings were reset after the user accepted the settings
+    reset prompt.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.TimeUntilAccepted" units="ms">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    The time between the settings reset prompt dialog being shown and the user
+    accepting the prompt.
+  </summary>
+</histogram>
+
+<histogram name="SettingsResetPrompt.TimeUntilDeclined" units="ms">
+  <owner>alito@chromium.org</owner>
+  <summary>
+    The time between the settings reset prompt dialog being shown and the user
+    declining the prompt.
+  </summary>
+</histogram>
+
 <histogram name="Setup.Install.ApplyArchivePatchTime" units="ms">
   <owner>grt@chromium.org</owner>
   <summary>
@@ -82653,6 +82736,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Requested"/>
 </enum>
 
+<enum name="BooleanRequired" type="int">
+  <int value="0" label="Not required"/>
+  <int value="1" label="Required"/>
+</enum>
+
 <enum name="BooleanReset" type="int">
   <int value="0" label="Not reset"/>
   <int value="1" label="Reset"/>
@@ -108521,6 +108609,21 @@ from previous Chrome versions.
   <int value="9" label="Bad time_between_prompts_seconds param"/>
 </enum>
 
+<enum name="SettingsResetPromptResetState" type="int">
+  <int value="1" label="Reset required"/>
+  <int value="2" label="Domain not matched, no reset required"/>
+  <int value="3" label="Already prompted for setting, no reset required"/>
+  <int value="4" label="Recently prompted, no reset required"/>
+  <int value="5" label="Other setting requires reset, no reset required"/>
+  <int value="6" label="Policy detected, no reset required"/>
+</enum>
+
+<enum name="SettingsResetPromptSettingsReset" type="int">
+  <int value="1" label="Homepage"/>
+  <int value="2" label="Default search engine"/>
+  <int value="3" label="Startup URLs"/>
+</enum>
+
 <enum name="SettingsSections" type="int">
   <summary>
     A collection of sections from chrome://settings. Used for metrics about
@@ -121449,6 +121552,13 @@ from previous Chrome versions.
   <affected-histogram name="SessionRestore.ForegroundTabFirstPaint3"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="SettingsResetPromptSettingType">
+  <suffix name="DefaultSearch" label="Reset state for default search engine."/>
+  <suffix name="StartupUrls" label="Reset state for startup URLs."/>
+  <suffix name="Homepage" label="Reset state for homepage."/>
+  <affected-histogram name="SettingsResetPrompt.ResetState"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="SetupInstallTimes" separator=".">
   <suffix name="background" label="Background; lowered priority."/>
   <affected-histogram name="Setup.Install.ApplyArchivePatchTime"/>