MacViews: Enable views based External Protocol dialog behind secondary-ui-md flag.

chrome/browser/ui/cocoa/external_protocol_dialog_views_mac.mm

Index: chrome/browser/ui/cocoa/external_protocol_dialog_views_mac.mm
diff --git a/chrome/browser/ui/cocoa/external_protocol_dialog_views_mac.mm b/chrome/browser/ui/cocoa/external_protocol_dialog_views_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..9caa71e210abe8b67bcc848ab904ed9666b11b45
--- /dev/null
+++ b/chrome/browser/ui/cocoa/external_protocol_dialog_views_mac.mm
@@ -0,0 +1,51 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/external_protocol/external_protocol_handler.h"
+
+#import "chrome/browser/ui/cocoa/external_protocol_dialog.h"
+#include "chrome/browser/ui/external_protocol_dialog_delegate.h"
+#include "chrome/browser/ui/views/external_protocol_dialog.h"
+#include "ui/base/material_design/material_design_controller.h"
+
+namespace {
+
+// Note: This is duplicated from
+// chrome/browser/ui/views/external_protocol_dialog.cc.
+void RunExternalProtocolDialogViews(const GURL& url,
+                                    int render_process_host_id,
+                                    int routing_id,
+                                    ui::PageTransition page_transition,
+                                    bool has_user_gesture) {
+  std::unique_ptr<ExternalProtocolDialogDelegate> delegate(
+      new ExternalProtocolDialogDelegate(url, render_process_host_id,
+                                         routing_id));
+  if (delegate->program_name().empty()) {
+    // ShellExecute won't do anything. Don't bother warning the user.
+    return;
+  }
+
+  // Windowing system takes ownership.
+  new ExternalProtocolDialog(std::move(delegate), render_process_host_id,
+                             routing_id);
+}
+
+}  // namespace
+
+// static
+void ExternalProtocolHandler::RunExternalProtocolDialog(
+    const GURL& url,
+    int render_process_host_id,
+    int routing_id,
+    ui::PageTransition page_transition,
+    bool has_user_gesture) {
+  if (ui::MaterialDesignController::IsSecondaryUiMaterial()) {
+    RunExternalProtocolDialogViews(url, render_process_host_id, routing_id,
+                                   page_transition, has_user_gesture);
+    return;
+  }
+  [[ExternalProtocolDialogController alloc] initWithGURL:&url
+                                     renderProcessHostId:render_process_host_id
+                                               routingId:routing_id];
+}