Add support for actions for multiple file selection.

Actions should be provided for selection, as it's common for users to
select more than one file and perform some operation them.

Eg. pinning 10 selected files.

NOPRESUBMIT=true
[email protected]
TEST=unit_tests: *FileSystemProvider*Action*
BUG=None

Review URL: https://codereview.chromium.org/1239043002

Cr-Commit-Position: refs/heads/master@{#351065}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 6661a311..1e8bd72 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -1120,6 +1120,8 @@
   DASHBOARDPRIVATE_SHOWPERMISSIONPROMPTFORDELEGATEDBUNDLEINSTALL,
   FILEMANAGERPRIVATEINTERNAL_GETENTRYACTIONS,
   FILEMANAGERPRIVATEINTERNAL_EXECUTEENTRYACTION,
+  FILEMANAGERPRIVATEINTERNAL_GETCUSTOMACTIONS,
+  FILEMANAGERPRIVATEINTERNAL_EXECUTECUSTOMACTION,
   MDNS_FORCEDISCOVERY,
   LANGUAGESETTINGSPRIVATE_GETLANGUAGELIST,
   LANGUAGESETTINGSPRIVATE_SETLANGUAGELIST,