Enable passing cast channel certificate authority keys.

BUG=417090

Review URL: https://codereview.chromium.org/627573002

Cr-Commit-Position: refs/heads/master@{#302141}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 8d0b10c9..1af3d2dd 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -969,6 +969,7 @@
   INPUTMETHODPRIVATE_GETINPUTMETHODCONFIG,
   WALLPAPERPRIVATE_GETSYNCSETTING,
   COPRESENCE_SETAUTHTOKEN,
+  CAST_CHANNEL_SETAUTHORITYKEYS,
   // Last entry: Add new entries above and ensure to update
   // tools/metrics/histograms/histograms.xml.
   ENUM_BOUNDARY