Initial implementation of the credit card assisted filling infobar.

On page load, this will prompt the user for automatic credit card filling. When user accepts the prompt, the credit card form is filled with their credit card data.

Several big TODOs:
* Opening a dialog to get the CVC (hoping to reuse PaymentRequest code)
* Only proposing the assist when the form is in the viewport.
* Offering more than 1 card in the infobar.

Mocks (internal): https://folio.googleplex.com/chrome-ux/mocks/304-payments-zero-integration/ZI_V2_Exploration/autofill-ahead-infobar#%2F06.png%3Fc=show

Video (public): https://drive.google.com/file/d/0B3xzZ-vFr2LRMW1yUkZDYWR4Um8/view?usp=sharing

BUG=630656
TEST=AssistManagerTest,AutofillCreditCardFillingInfoBarDelegateMobileTest

Review-Url: https://codereview.chromium.org/2026353002
Cr-Commit-Position: refs/heads/master@{#409841}
diff --git a/components/autofill_strings.grdp b/components/autofill_strings.grdp
index 4b7b57e..1c8fef8a 100644
--- a/components/autofill_strings.grdp
+++ b/components/autofill_strings.grdp
@@ -174,13 +174,18 @@
     Use password for:
   </message>
 
+  <!-- Autofill Credit Card Assisted Filling Infobar -->
+  <message name="IDS_AUTOFILL_CREDIT_CARD_FILLING_INFOBAR_TITLE" desc="Title text for the Autofill Credit Card Assisted Filling Infobar">
+    Do you want to fill in your card info?
+  </message>
+  <message name="IDS_AUTOFILL_CREDIT_CARD_FILLING_INFOBAR_ACCEPT" desc="Text to show for the Autofill credit card Assisted Filling infobar accept button.">
+    Fill in
+  </message>
+
   <!-- Autofill save credit card bubble or infobar prompt -->
   <message name="IDS_AUTOFILL_SAVE_CARD_PROMPT_ACCEPT" desc="Text to show for the Autofill save credit card prompt accept button. The prompt can be either a bubble or an infobar.">
     Save
   </message>
-  <message name="IDS_AUTOFILL_SAVE_CARD_PROMPT_DENY" desc="Text to show for the Autofill save credit card prompt deny button. The prompt can be either a bubble or an infobar.">
-    No thanks
-  </message>
   <if expr="_google_chrome">
     <message name="IDS_AUTOFILL_SAVE_CARD_PROMPT_TITLE_LOCAL" desc="Title text for the Autofill save card prompt when the card is to be saved locally. The prompt can be either a bubble or an infobar.">
       Do you want Chrome to save this card?