This patch enables "mailto" links in WebViews.

chrome/browser/apps/guest_view/web_view_browsertest.cc

 // Copyright 2013 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 <queue>
 
 #include "base/location.h"
 #include "base/path_service.h"
 #include "base/process/process.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 2466 matching lines @@
       web_view_contents);
   EXPECT_TRUE(load_success);
 
   gfx::Rect web_view_container_bounds = web_view_contents->GetContainerBounds();
   gfx::Rect mime_handler_view_container_bounds =
       mime_handler_view_contents->GetContainerBounds();
   EXPECT_EQ(web_view_container_bounds.origin(),
             mime_handler_view_container_bounds.origin());
 }
 
+IN_PROC_BROWSER_TEST_F(WebViewTest, Shim_TestMailtoLink) {
+  TestHelper("testMailtoLink", "web_view/shim", NEEDS_TEST_SERVER);
+}
+
 #if defined(USE_AURA)
 // TODO(wjmaclean): when WebViewTest is re-enabled on the site-isolation
 // bots, then re-enable this test class as well.
 // https://crbug.com/503751
 class WebViewFocusTest : public WebViewTest {
  public:
   ~WebViewFocusTest() override {}
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     WebViewTest::SetUpCommandLine(command_line);
@@ skipping 117 matching lines @@
   // Generate and send synthetic touch event.
   FocusWaiter waiter(aura_webview);
   content::SimulateTouchPressAt(GetEmbedderWebContents(),
                                 guest_rect.CenterPoint());
 
   // Wait for the TouchStart to propagate and restore focus. Test times out
   // on failure.
   waiter.Wait();
 }
 #endif