[Web Payments] Add inline items to the Order Summary section.

components/payments_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
 
   <message name="IDS_PAYMENTS_TITLE" desc="Title of the dialog that presents a request for payment for some good or service [Desktop and iOS only].">
     Your Payment
   </message>
   <message name="IDS_PAYMENTS_NAME_FIELD_IN_CONTACT_DETAILS" desc="The label for text input field containing the full name of a person. [CHAR-LIMIT=32]" formatter_data="android_java">
     Name
   </message>
   <message name="IDS_PAYMENTS_SAVE_CARD_TO_DEVICE_CHECKBOX" desc="The label for the checkbox that enables the user to save a credit card to their device, for example, on their phone." formatter_data="android_java">
@@ skipping 158 matching lines @@
   </message>
   <message name="IDS_PAYMENT_REQUEST_ORDER_SUMMARY_SECTION_TOTAL_FORMAT" desc="The format specifier of the Total label in the Order Summary section of the Payment Sheet of the Payment Request dialog.">
     <ph name="TOTAL_LABEL">$1<ex>Total</ex></ph> <ph name="CURRENCY_CODE">$2<ex>USD</ex></ph> <ph name="FORMATTED_TOTAL_AMOUNT">$3<ex>$ 12.34</ex></ph>
   </message>
   <message name="IDS_PAYMENT_REQUEST_PAYMENT_METHOD_SECTION_NAME" desc="The name of the Payment Method section in the Payment Sheet of the Payment Request dialog.">
     Payment
   </message>
   <message name="IDS_PAYMENT_REQUEST_ORDER_SUMMARY_SHEET_TOTAL_FORMAT" desc="The format specifier of the Total label in the Order Summary Sheet of the Payment Request dialog.">
     <ph name="CURRENCY_CODE">$1<ex>USD</ex></ph> <ph name="FORMATTED_TOTAL_AMOUNT">$2<ex>$ 12.34</ex></ph>
   </message>
+  <message name="IDS_PAYMENT_REQUEST_ORDER_SUMMARY_MORE_ITEMS" desc="The label in the Order Summary section of the Payment Sheet that indicates how many display items are hidden.">
+    <ph name="ITEM_COUNT">$1<ex>2</ex></ph> more items...
+  </message>
   <message name="IDS_PAYMENT_REQUEST_SHIPPING_SECTION_NAME" desc="The name of the Shipping Address section in the Payment Sheet of the Payment Request dialog.">
     Shipping address
   </message>
   <message name="IDS_PAYMENT_REQUEST_CONTACT_INFO_SECTION_NAME" desc="The name of the Contact Info section in the Payment Sheet of the Payment Request dialog.">
     Contact info
   </message>
 
   <!-- Shipping address in web payments API -->
   <message name="IDS_PAYMENTS_SHIPPING_SUMMARY_LABEL" desc="The title for the section of shipping information. Shipping is typically used for packages." formatter_data="android_java">
     Shipping
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   <message name="IDS_PAYMENTS_UNSUPPORTED_PICKUP_ADDRESS" desc="Text implying that a user needs to choose a different pickup address, because the currently selected address is not supported. This address can be used, for example, for laundry pickup." formatter_data="android_java">
     Unsupported pickup address. Select a different address.
   </message>
   <message name="IDS_PAYMENTS_UNSUPPORTED_PICKUP_OPTION" desc="Text implying that a user needs to choose a different pickup option, because the currently selected option is not supported. This option can be used, for example, for laundry pickup." formatter_data="android_java">
     That pickup option isn’t available. Try a different option.
   </message>
   <message name="IDS_PAYMENTS_ANDROID_APP_ERROR" desc="Error message that is shown when an Android payment application fails to start." formatter_data="android_java">
     Unable to launch payment app.
   </message>
 </grit-part>