Add ChromeStartupDelegate histograms

Add histogram and enum entries for ChromeStartupDelegate. These will be
emitted downstream in: https://crrev.com/i/3387163.

Bug: 1143402
Change-Id: Ic509f91c4823c3a3a6401e7d0025880d0200e13b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522902Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825358}

tools/metrics/histograms/enums.xml

@@ -10155,6 +10155,12 @@ histogram as enum -->
   <int value="1" label="A hash is saved"/>
 </enum>
 
+<enum name="ChromeStartupDelegateResult">
+  <int value="0" label="Failure"/>
+  <int value="1" label="Allow"/>
+  <int value="2" label="Disallow"/>
+</enum>
+
 <enum name="ChromeVoxGestureType">
   <int value="1" label="click"/>
   <int value="2" label="swipeDown1"/>

tools/metrics/histograms/histograms_xml/android/histograms.xml

@@ -319,6 +319,28 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
   </summary>
 </histogram>
 
+<histogram name="Android.ChromeStartupDelegate.Result"
+    enum="ChromeStartupDelegateResult" expires_after="2021-07-01">
+  <owner>chouinard@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>Records the result for ChromeStartupDelegate.</summary>
+</histogram>
+
+<histogram name="Android.ChromeStartupDelegate.{Result}.Time" units="ms"
+    expires_after="2021-07-01">
+  <owner>chouinard@chromium.org</owner>
+  <owner>twellington@chromium.org</owner>
+  <summary>
+    Records the time taken to fetch a result for ChromeStartupDelegate.
+  </summary>
+  <token key="Result">
+    <variant name="All"/>
+    <variant name="Allow"/>
+    <variant name="Disallow"/>
+    <variant name="Failure"/>
+  </token>
+</histogram>
+
 <histogram name="Android.CompressedResources.ExtractionBlockingTime" units="ms"
     expires_after="M82">
   <owner>estevenson@chromium.org</owner>