Allow Safe Browsing backend to select downloads to upload.

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 a48b639be0332459b01b6c1aa2dfa29ed3bab85a..d0da00870024b1226f6f2dad0881827cd473773f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -58444,6 +58444,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="SBDownloadFeedback.UploadRequestedByServer"
+    enum="DownloadUploadRequestedByServer">
+  <owner>nparker@chromium.org</owner>
+  <summary>
+    For each non-SAFE file, records whether the server requested that that file
+    be uploaded.
+
+    Logged before checking the file size, so it may be dropped there.
+  </summary>
+</histogram>
+
 <histogram name="SBDownloadFeedback.UploadResult"
     enum="SBDownloadFeedbackUploadResult">
   <owner>mattm@chromium.org</owner>
@@ -85771,6 +85782,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="6" label="Initiated by Automatic Resumption"/>
 </enum>
 
+<enum name="DownloadUploadRequestedByServer" type="int">
+  <int value="0" label="No Upload"/>
+  <int value="1" label="Upload Requested"/>
+</enum>
+
 <enum name="DragDropEventSource" type="int">
   <int value="0" label="Mouse"/>
   <int value="1" label="Touch"/>