Adding metrics on the usefulness of the Win10 version of the Welcome Page

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 6b6e981dc7970b28496b78351a4e9d5a4c56d3ef..29802e0127c83ea67aa661564279bbeb81c8b511 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -73764,6 +73764,22 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Welcome.Win10.DefaultPromptResult" enum="BooleanDefault">
+  <owner>tmartino@chromium.org</owner>
+  <summary>
+    Records whether or not Chrome was the default browser when the user left the
+    Win10-specific Welcome page.
+  </summary>
+</histogram>
+
+<histogram name="Welcome.Win10.PinnedPromptResult" enum="BooleanPinned">
+  <owner>tmartino@chromium.org</owner>
+  <summary>
+    Records whether or not Chrome was pinned to the taskbar when the user left
+    the Win10-specific Welcome page.
+  </summary>
+</histogram>
+
 <histogram name="Win8.PageLoad" enum="Win8PageLoadType">
   <owner>zturner@chromium.org</owner>
   <summary>
@@ -76649,6 +76665,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Persisted"/>
 </enum>
 
+<enum name="BooleanPinned" type="int">
+  <int value="0" label="Not Pinned"/>
+  <int value="1" label="Pinned"/>
+</enum>
+
 <enum name="BooleanPopulated" type="int">
   <int value="0" label="Not populated"/>
   <int value="1" label="Populated"/>
@@ -113437,6 +113458,19 @@ value.
   <affected-histogram name="NewTabPage.DefaultPageType"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="WelcomeWin10Variant">
+  <owner>tmartino@chromium.org</owner>
+  <suffix name="InlineCombined" label="Inline layout style, combined promo"/>
+  <suffix name="InlineDefault"
+      label="Inline layout style, default browser promo only"/>
+  <suffix name="SectionedCombined"
+      label="Sectioned layout style, combined promo"/>
+  <suffix name="SectionedDefault"
+      label="Sectioned layout style, default browser promo only"/>
+  <affected-histogram name="Welcome.Win10.DefaultPromptResult"/>
+  <affected-histogram name="Welcome.Win10.PinnedPromptResult"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="WrenchMenuActionTimings" separator=".">
   <suffix name="NewTab"/>
   <suffix name="NewWindow"/>