mac: Prevent Address Book permissions dialog from erroneously appearing.

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 9f0f16be938fb82af21bb52fbf60ef9e2a80baa5..4a1a7b3918ecac46684aa56d55e33afb7d6048f8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -1545,6 +1545,16 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Autofill.AddressBook.AccessSkipped" enum="BooleanSkipped">
+  <owner>erikchen@chromium.org</owner>
+  <summary>
+    Whether an attempt to access the Mac AddressBook was skipped because doing
+    so would incorrectly cause the appearance of the permissions dialog. This
+    happens when Chrome auto-update changes the binary on disk before the first
+    AddressBook access attempt.
+  </summary>
+</histogram>
+
 <histogram name="Autofill.AddressBookAvailable" enum="BooleanAvailable">
   <owner>isherman@chromium.org</owner>
   <summary>
@@ -33636,6 +33646,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="1" label="Selected"/>
 </enum>
 
+<enum name="BooleanSkipped" type="int">
+  <int value="0" label="Not skipped"/>
+  <int value="1" label="Skipped"/>
+</enum>
+
 <enum name="BooleanStale" type="int">
   <int value="0" label="Fresh"/>
   <int value="1" label="Stale"/>