Handle WebContentsViewMac being destroyed while a <select> menu is showing.

chrome/browser/ui/cocoa/tab_contents/web_contents_view_mac_interactive_uitest.mm

+// 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.
+
+#import <Cocoa/Cocoa.h>
+
+#import "base/mac/scoped_nsobject.h"
+#include "base/run_loop.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/interactive_test_utils.h"
+#include "content/public/browser/native_web_keyboard_event.h"
+#include "content/public/browser/render_widget_host.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/web_contents.h"
+#import "testing/gtest_mac.h"
+
+using WebContentsViewMacInteractiveTest = InProcessBrowserTest;
+
+// Integration test for a <select> popup run by the Mac-specific
+// content::PopupMenuHelper, owned by a WebContentsViewMac.
+IN_PROC_BROWSER_TEST_F(WebContentsViewMacInteractiveTest, SelectMenuLifetime) {
+  EXPECT_TRUE(ui_test_utils::BringBrowserWindowToFront(browser()));
+  EXPECT_TRUE(embedded_test_server()->Start());
+
+  // Open a tab with a <select> element, which starts focused.
+  AddTabAtIndex(1, GURL(embedded_test_server()->GetURL("/select.html")),
+                ui::PAGE_TRANSITION_LINK);
+
+  base::RunLoop outer_run_loop;
+  base::RunLoop* outer_run_loop_for_block = &outer_run_loop;
+  __block base::scoped_nsobject<NSString> first_item;
+
+  // Wait for a native menu to open.
+  id token = [[NSNotificationCenter defaultCenter]
+      addObserverForName:NSMenuDidBeginTrackingNotification
+                  object:nil
+                   queue:nil
+              usingBlock:^(NSNotification* notification) {
+                first_item.reset(
+                    [[[[notification object] itemAtIndex:0] title] copy]);
+                // The nested run loop runs next. Ensure the outer run loop
+                // exits once the inner run loop quits.
+                outer_run_loop_for_block->Quit();
+
+                // We can't cancel tracking until after
+                // NSMenuDidBeginTrackingNotification is processed (i.e. after
+                // this block returns). So post a task to run on the inner run
+                // loop which will close the tab (and cancel tracking in
+                // ~PopupMenuHelper()).
+                base::ThreadTaskRunnerHandle::Get()->PostTask(
+                    FROM_HERE,
+                    base::Bind(
+                        base::IgnoreResult(&TabStripModel::CloseWebContentsAt),
+                        base::Unretained(browser()->tab_strip_model()), 1, 0));
+              }];
+
+  // Send a space key to open the <select>.
+  content::NativeWebKeyboardEvent event(
+      blink::WebKeyboardEvent::kChar, blink::WebInputEvent::kNoModifiers,
+      blink::WebInputEvent::kTimeStampForTesting);
+  event.text[0] = ' ';
+  browser()
+      ->tab_strip_model()
+      ->GetActiveWebContents()
+      ->GetRenderWidgetHostView()
+      ->GetRenderWidgetHost()
+      ->ForwardKeyboardEvent(event);
+
+  EXPECT_EQ(2, browser()->tab_strip_model()->count());
+  outer_run_loop.Run();
+
+  [[NSNotificationCenter defaultCenter] removeObserver:token];
+
+  EXPECT_NSEQ(@"Apple", first_item);  // Was it the menu we expected?
+  EXPECT_EQ(1, browser()->tab_strip_model()->count());
+}