[Autofill] Migrate ContentAutofillDriver<-->AutofillAgent IPCs to mojo.

components/autofill/content/public/interfaces/autofill_agent.mojom

Index: components/autofill/content/public/interfaces/autofill_agent.mojom
diff --git a/components/autofill/content/public/interfaces/autofill_agent.mojom b/components/autofill/content/public/interfaces/autofill_agent.mojom
index 40c501dd0e0e23a019e0ae6bc34dc416b42d2d82..cbdb78d379c184a29db9dac036d107da495c7baa 100644
--- a/components/autofill/content/public/interfaces/autofill_agent.mojom
+++ b/components/autofill/content/public/interfaces/autofill_agent.mojom
@@ -4,8 +4,51 @@
 
 module autofill.mojom;
 
+import "components/autofill/content/public/interfaces/autofill_types.mojom";
+
+// There is one instance of this interface per render frame in the render
+// process.
 interface AutofillAgent {
   // Tells the render frame that a user gesture was observed
   // somewhere in the tab (including in a different frame).
   FirstUserGestureObservedInTab();
+
+  // Instructs the renderer to fill the active form with the given form data.
+  // Please refer AutofillDriver.QueryFormFieldAutofill comments about the |id|.
+  FillForm(int32 id, FormData form);
+
+  // Instructs the renderer to preview the active form with the given form data.
+  // Please refer AutofillDriver.QueryFormFieldAutofill comments about the |id|.
+  PreviewForm(int32 id, FormData form);
+
+  // Sends the heuristic and server field type predictions to the renderer.
+  FieldTypePredictionsAvailable(array<FormDataPredictions> forms);
+
+  // Clears the currently displayed Autofill results.
+  ClearForm();
+
+  // Tells the renderer that the Autofill previewed form should be cleared.
+  ClearPreviewedForm();
+
+  // Sets the currently selected node's value.
+  FillFieldWithValue(string value);
+
+  // Sets the suggested value for the currently previewed node.
+  PreviewFieldWithValue(string value);
+
+  // Sets the currently selected node's value to be the given data list value.
+  AcceptDataListSuggestion(string value);
+
+  // Tells the renderer to fill the username and password with with given
+  // values.
+  FillPasswordSuggestion(string username, string password);
+
+  // Tells the renderer to preview the username and password with the given
+  // values.
+  PreviewPasswordSuggestion(string username, string password);
+
+  // Sent when a password form is initially detected and suggestions should be
+  // shown. Used by the fill-on-select experiment.
+  // |key| is the unique id associated with the password form fill data.
+  ShowInitialPasswordAccountSuggestions(int32 key, PasswordFormFillData form_data);
 };