Android - Introduce "keyboard accessory" for Autofill suggestions.

components/autofill/core/common/autofill_switches.cc

Index: components/autofill/core/common/autofill_switches.cc
diff --git a/components/autofill/core/common/autofill_switches.cc b/components/autofill/core/common/autofill_switches.cc
index 6cf1c858891a581fa6a9921d4c891ce20281eab0..83c38a18a4495cd79b57c64b2e6727de672d9ab9 100644
--- a/components/autofill/core/common/autofill_switches.cc
+++ b/components/autofill/core/common/autofill_switches.cc
@@ -28,6 +28,9 @@ const char kDisablePasswordGeneration[]     = "disable-password-generation";
 // The "disable" flag for kEnableSingleClickAutofill.
 const char kDisableSingleClickAutofill[]    = "disable-single-click-autofill";
 
+const char kEnableAccessorySuggestionView[] =
+    "enable-autofill-keyboard-accessory-view";
+
 // Enables using device's camera to scan a new credit card when filling out a
 // credit card form.
 const char kEnableCreditCardScan[]          = "enable-credit-card-scan";