Ensure nearby URL count metric is properly initialized

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 5aaf095bcbadf0f60c8deb5cb1597140eac99975..8fec24b618a6bb612d9b8afecdad56014c57f307 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -42920,6 +42920,19 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Omnibox.PhysicalWebProvider.SuggestionUsedWithoutOmniboxFocus"
+    enum="Boolean">
+  <owner>cco3@chromium.org</owner>
+  <owner>mattreynolds@chromium.org</owner>
+  <owner>mmocny@chromium.org</owner>
+  <summary>
+    Records a boolean value indicating whether the Physical Web provider was
+    invoked by focusing the omnibox during the current omnibox session. Recorded
+    when the user selects an omnibox suggestion. Does not record when the
+    Physical Web omnibox provider is disabled.
+  </summary>
+</histogram>
+
 <histogram name="Omnibox.PhysicalWebProviderMatches">
   <owner>cco3@chromium.org</owner>
   <owner>mattreynolds@chromium.org</owner>
@@ -43072,14 +43085,28 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="Omnibox.SuggestionUsed.NearbyURLCount" units="URLs">
+<histogram name="Omnibox.SuggestionUsed.NearbyURLCount.AtFocus" units="URLs">
+  <owner>cco3@chromium.org</owner>
+  <owner>mattreynolds@chromium.org</owner>
+  <owner>mmocny@chromium.org</owner>
+  <summary>
+    The number of nearby Physical Web URLs when Physical Web Provider was last
+    focused (i.e., the start of the current session). Recorded when the user
+    accepts an omnibox suggestion, regardless of whether the suggestion came
+    from PhysicalWebProvider. Capped at 50.
+  </summary>
+</histogram>
+
+<histogram name="Omnibox.SuggestionUsed.NearbyURLCount.AtMatchCreation"
+    units="URLs">
   <owner>cco3@chromium.org</owner>
   <owner>mattreynolds@chromium.org</owner>
   <owner>mmocny@chromium.org</owner>
   <summary>
-    The number of nearby Physical Web URLs when the user focused the omnibox.
-    Recorded when the user accepts an omnibox suggestion, regardless of whether
-    the suggestion came from PhysicalWebProvider. Capped at 50.
+    The number of nearby Physical Web URLs when Physical Web Provider last
+    constructed matches. Recorded when the user accepts an omnibox suggestion,
+    regardless of whether the suggestion came from PhysicalWebProvider. Capped
+    at 50.
   </summary>
 </histogram>