[Payments] Update billing address dropdown style to match the design

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
index fcbed1fb0d60afa8447c07ea37e6e55234370963..eb099cb3da0a1b93df61f03d98a9776eb60cad6a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/EditorDropdownField.java
@@ -70,8 +70,8 @@ class EditorDropdownField implements EditorFieldView {
         } else {
             adapter = new ArrayAdapter<DropdownKeyValue>(
                     context, R.layout.multiline_spinner_item, dropdownKeyValues);
+            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

[Ian Wen, 2016/12/21 23:04:25]

I think there is a better way here:
1. replace R.layout.multiline_spinner_item with
R.layout.payment_request_dropdown_item.
2. remove #73.
3. in getDropDownView(), call super.getDropDownView() to get a view, and don't
bother to inflate the view yourself.

[gogerald1, 2017/01/04 16:00:51]

Not sure I understand this comment correctly. 

Here, multiline_spinner_item is for getView when dropdown is not showing,
simple_spinner_drop_down_item is for getDropdownView when showing dropdown. They
have different style. 
And I intend to change the billing address dropdown but not others (even though
the spinner dropdown box changed a little bit), so I moved this setting inside.
In addition, we did not extend ArrayAdapter in this case.

         }
-        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 
         mDropdown = (Spinner) mLayout.findViewById(R.id.spinner);
         mDropdown.setTag(this);
@@ -92,6 +92,8 @@ class EditorDropdownField implements EditorFieldView {
             @Override
             public void onNothingSelected(AdapterView<?> parent) {}
         });
+        // Remove padding so that dropdown has the same width as the spinner.
+        mDropdown.setPadding(0, 0, 0, 0);

[Ian Wen, 2016/12/21 23:04:25]

Could this be done in xml? If so, let's do it there.

[gogerald1, 2017/01/04 16:00:51]

Done.

     }
 
     /** @return The View containing everything. */