Adds API inputMethodPrivate.getEncryptSyncEnabled which will be used for input method personal dictionary sync.

BUG=481289
TEST=Verified on clapper device.

Review URL: https://codereview.chromium.org/1155153002

Cr-Commit-Position: refs/heads/master@{#331512}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 55674ac4..67d5ea96 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -1102,6 +1102,7 @@
   PLATFORMKEYS_VERIFYTLSSERVERCERTIFICATE,
   DEVELOPERPRIVATE_SETSHORTCUTHANDLINGSUSPENDED,
   DEVELOPERPRIVATE_UPDATEEXTENSIONCOMMAND,
+  INPUTMETHODPRIVATE_GETENCRYPTSYNCENABLED,
   // Last entry: Add new entries above and ensure to update
   // tools/metrics/histograms/histograms.xml.
   ENUM_BOUNDARY