[Downloads UI] Add histograms for file extensions

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
index 860c316204677d7ff12b23ac168950e53e00ff8e..7d123b826a4df5af734aa5f85c179c4ef5fe2297 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadUtils.java
@@ -272,6 +272,12 @@ public class DownloadUtils {
             if (selectedItemsFilterType != wrappedItem.getFilterType()) {
                 selectedItemsFilterType = DownloadFilter.FILTER_ALL;
             }
+            if (wrappedItem.getFilterType() == DownloadFilter.FILTER_OTHER) {
+                RecordHistogram.recordEnumeratedHistogram(
+                        "Android.DownloadManager.OtherExtensions.Share",
+                        wrappedItem.getFileExtensionType(),
+                        DownloadHistoryItemWrapper.FILE_EXTENSION_BOUNDARY);
+            }
 
             String mimeType = Intent.normalizeMimeType(wrappedItem.getMimeType());