[Payments] Display host name for opened payment handler window and elide it from left to right

Bug: 829965
Change-Id: I0edaa674fc4820dc6229270abd53ba92ae72d18a
Reviewed-on: https://chromium-review.googlesource.com/1057845Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558387}

chrome/browser/ui/views/payments/payment_handler_web_flow_view_controller.cc

@@ -83,7 +83,8 @@ class ReadOnlyOriginView : public views::View {
 
     title_origin_layout->StartRow(0, 0);
     views::Label* origin_label =
-        new views::Label(base::UTF8ToUTF16(origin.spec()));
+        new views::Label(base::UTF8ToUTF16(origin.host()));
+    origin_label->SetElideBehavior(gfx::ELIDE_HEAD);
     if (!title_is_valid) {
       // Set the origin as title when the page title is invalid.
       origin_label->set_id(static_cast<int>(DialogViewID::SHEET_TITLE));