Record Code Signature of Downloaded DMG files

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 df5dbbca25f4e8a4e22639aef070f7db1411c1b4..eb64f0a379c54b7021cef7ba6435ddc4d4b6f028 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22133,7 +22133,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Records the source that requested showing the feedback app.</summary>
 </histogram>
 
-<histogram name="FileBrowser.ChangeDirectory.RootType" enum="FileManagerRootType">
+<histogram name="FileBrowser.ChangeDirectory.RootType"
+    enum="FileManagerRootType">
   <owner>yamaguchi@chromium.com</owner>
   <summary>
     Chrome OS File Browser: Counts the number of directory-changed events,
@@ -65065,6 +65066,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="SBClientDownload.DownloadFileHasDmgSignature" enum="Boolean">
+  <owner>jialiul@chromium.org</owner>
+  <summary>
+    A Mac-only metric that records whether a given download file is a 
+    cryptographically signed DMG archive. This metric is logged before Chrome 
+    sends SafeBrowsing download pings.
+  </summary>
+</histogram>
+
 <histogram
     name="SBClientDownload.DownloadFileWithoutDiskImageExtensionHasKolySignature"
     enum="Boolean">
@@ -80601,10 +80611,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>sorin@chromium.org</owner>
   <summary>
     The number of download jobs found in the Windows BITS queue. This value is
-    expected to be zero in most cases, or a small number otherwise.
-    Large values indicate a problem with the job creation or clean up code.
-    The metric is recorded before a new BITS job is created and inserted
-    into BITS queue.
+    expected to be zero in most cases, or a small number otherwise. Large values
+    indicate a problem with the job creation or clean up code. The metric is
+    recorded before a new BITS job is created and inserted into BITS queue.
   </summary>
 </histogram>