Disable the save button if name is empty

During the name fix flow, the cardholder name is empty at times (reason unknown,
but mostly because of sync)
In such a scenario, we should have the save card button on the dialog
disabled by default

Bug: 929421
Change-Id: I195422134a263bc201caec2059f4834f7476eb43
Reviewed-on: https://chromium-review.googlesource.com/c/1487144Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Commit-Queue: Siddharth Shah <siashah@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635617}

chrome/android/java/src/org/chromium/chrome/browser/autofill/AutofillNameFixFlowPrompt.java

@@ -82,6 +82,8 @@ public class AutofillNameFixFlowPrompt implements TextWatcher, ModalDialogProper
                                .with(ModalDialogProperties.NEGATIVE_BUTTON_TEXT,
                                        context.getResources(), R.string.cancel)
                                .with(ModalDialogProperties.CANCEL_ON_TOUCH_OUTSIDE, true)
+                               .with(ModalDialogProperties.POSITIVE_BUTTON_DISABLED,
+                                       inferredName.isEmpty())
                                .build();
 
         // Hitting the "submit" button on the software keyboard should submit.