[Autofill Assistant] Changed comment for KeyPress.keyboard_input proto for clarification.

Bug: 806868
Change-Id: Iba3d0a38f1d215880b3479a5c1baa2d3d4d97b24
Reviewed-on: https://chromium-review.googlesource.com/c/1355164Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#612257}

components/autofill_assistant/browser/actions/set_form_field_value_action.cc

@@ -75,7 +75,7 @@ void SetFormFieldValueAction::OnSetFieldValue(ActionDelegate* delegate,
       // DEPRECATED: the field `keycode' used to contain a single character to
       // input as text. Since there is no easy way to convert keycodes to text,
       // this field is now deprecated and only works for US-ASCII characters.
-      // You should use the `key' field instead.
+      // You should use the `keyboard_input' field instead.
       if (key_field.keycode() < 128) {  // US-ASCII
         delegate->SendKeyboardInput(
             selector, std::string(1, char(key_field.keycode())),

components/autofill_assistant/browser/service.proto

@@ -579,10 +579,9 @@ message SetFormFieldValueProto {
       string text = 1;
       // DEPRECATED: A single US-ASCII character (e.g., 13 for carriage return).
       int32 keycode = 2;
-      // One or multiple UTF-8 characters to input in the form element. In
-      // contrast to |text|, |keyboard_input| is evaluated as if the user had
-      // tapped the keyboard. This can also be used for control sequences such
-      // as "\r".
+      // Text as generated by processing a virtual key code with a keyboard
+      // layout. This can also be used for keyboard control sequences such
+      // as "\r" or "\t".
       string keyboard_input = 3;
     }
   }