Add "previewing on hover" support for single-field autocomplete input

components/autofill/core/browser/autofill_driver.h

Index: components/autofill/core/browser/autofill_driver.h
diff --git a/components/autofill/core/browser/autofill_driver.h b/components/autofill/core/browser/autofill_driver.h
index 933ef689b3f80fd0a5d7d523416c76f6a73155a1..ddcef322d8c6f1b7ac09a0184e8fcfb655dda18d 100644
--- a/components/autofill/core/browser/autofill_driver.h
+++ b/components/autofill/core/browser/autofill_driver.h
@@ -82,7 +82,13 @@ class AutofillDriver {
   virtual void RendererShouldClearPreviewedForm() = 0;
 
   // Tells the renderer to set the node text.
-  virtual void RendererShouldSetNodeText(const base::string16& value) = 0;
+  virtual void RendererShouldFillFieldWithValue(
+      const base::string16& value) = 0;
+
+  // Tells the renderer to preview the node with suggested text.
+  virtual void RendererShouldPreviewFieldWithValue(
+      const base::string16& value) = 0;
+
 };
 
 }  // namespace autofill