UMA metrics added for HID detection dialog.

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 562a2802025dffe5edb0d3a9643456f3700ea312..8d6c98018d537ad793c0a214d04d113982a62a03 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -7547,6 +7547,30 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="HIDDetection.OOBEDevicesDetectedOnContinuePressed"
+    enum="HIDContinueScenarioType">
+  <owner>merkulova@chromium.org</owner>
+  <summary>
+    Which HID were detected when user pressed Continue on OOBE dialog. This
+    metric is specific to ChromeOS.
+  </summary>
+</histogram>
+
+<histogram name="HIDDetection.OOBEDialogShown">
+  <owner>merkulova@chromium.org</owner>
+  <summary>
+    Whether HID detection dialog was shown on OOBE. This metric is specific to

[Alexei Svitkine (slow), 2014/05/14 14:57:48]

Maybe expand this to clarify exactly when it's logged? (e.g. "logged once per
OOBE when Continue is pressed" or something)

[merkulova, 2014/05/22 12:02:32]

Done.

+    ChromeOS.
+  </summary>
+</histogram>
+
+<histogram name="HIDDetection.TimesDialogShownPerOOBECompleted">
+  <owner>merkulova@chromium.org</owner>
+  <summary>
+    Records number of times the dialog was shown by the time OOBE is completed.

[Alexei Svitkine (slow), 2014/05/14 14:57:48]

Nit: Add "This metric is specific to ChromeOS."

[merkulova, 2014/05/22 12:02:32]

Done.

+  </summary>
+</histogram>
+
 <histogram name="History.DeleteFTSIndexDatabases">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
@@ -35730,6 +35754,13 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="12" label="SERVICE_ERROR"/>
 </enum>
 
+<enum name="HIDContinueScenarioType" type="int">
+  <summary>Possible detected devices combination on leaving dialog</summary>
+  <int value="0" label="Pointing device only detected."/>
+  <int value="1" label="Keyboard device only detected."/>
+  <int value="2" label="Both devices, pointing and keyboard, detected."/>
+</enum>
+
 <enum name="HistoryFaviconsRecoveryEnum" type="int">
   <summary>Error states noted in thumbnail_database.cc recovery code.</summary>
   <int value="0" label="RECOVERY_EVENT_RECOVERED">Successful recovery.</int>