Add switch to chrome://flags for enabling manual fallbacks for filling.

BUG=739343

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Change-Id: I5aac58e8e4675c3a12044130b5b9329a743f1361
Reviewed-on: https://chromium-review.googlesource.com/586604
Reviewed-by: Vadym Doroshenko <[email protected]>
Commit-Queue: Tatiana Gornak <[email protected]>
Cr-Commit-Position: refs/heads/master@{#490757}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 3eebd94..ba27ad0 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -227,6 +227,9 @@
 extern const char kEnableIdleTimeSpellCheckingName[];
 extern const char kEnableIdleTimeSpellCheckingDescription[];
 
+extern const char kEnableManualFallbacksFillingName[];
+extern const char kEnableManualFallbacksFillingDescription[];
+
 extern const char kEnableMaterialDesignBookmarksName[];
 extern const char kEnableMaterialDesignBookmarksDescription[];