Don't rely on untrusted events in site isolation browser test.

content/browser/site_per_process_browsertest.cc

 // Copyright (c) 2012 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 "content/browser/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 7050 matching lines @@
   FrameTreeNode* child2 = root->child_at(1);
   RenderProcessHost* process1 = child1->current_frame_host()->GetProcess();
   RenderProcessHost* process2 = child2->current_frame_host()->GetProcess();
 
   // Navigate both subframes to a page with a <select> element.
   NavigateFrameToURL(child1, embedded_test_server()->GetURL(
       "b.com", "/site_isolation/page-with-select.html"));
   NavigateFrameToURL(child2, embedded_test_server()->GetURL(
       "c.com", "/site_isolation/page-with-select.html"));
 
-  // Open both <select> menus.  This creates a popup widget in both processes.
+  // Open both <select> menus by focusing each item and sending a space key
+  // at the focused node. This creates a popup widget in both processes.
   // Wait for and then drop the ViewHostMsg_ShowWidget messages, so that both
   // widgets are left in pending-but-not-shown state.
+  NativeWebKeyboardEvent event;
+  event.text[0] = ' ';
+  event.timeStampSeconds = 100;
+  event.type = blink::WebKeyboardEvent::Char;
+
   scoped_refptr<PendingWidgetMessageFilter> filter1 =
       new PendingWidgetMessageFilter();
   process1->AddFilter(filter1.get());
-  EXPECT_TRUE(ExecuteScript(child1, "openSelectMenu();"));
+  EXPECT_TRUE(ExecuteScript(child1, "focusSelectMenu();"));
+  child1->current_frame_host()->GetRenderWidgetHost()->ForwardKeyboardEvent(
+      event);
   filter1->Wait();
 
   scoped_refptr<PendingWidgetMessageFilter> filter2 =
       new PendingWidgetMessageFilter();
   process2->AddFilter(filter2.get());
-  EXPECT_TRUE(ExecuteScript(child2, "openSelectMenu();"));
+  EXPECT_TRUE(ExecuteScript(child2, "focusSelectMenu();"));
+  child2->current_frame_host()->GetRenderWidgetHost()->ForwardKeyboardEvent(
+      event);
   filter2->Wait();
 
   // At this point, we should have two pending widgets.
   EXPECT_TRUE(
       ContainsKey(web_contents()->pending_widget_views_,
                   std::make_pair(process1->GetID(), filter1->routing_id())));
   EXPECT_TRUE(
       ContainsKey(web_contents()->pending_widget_views_,
                   std::make_pair(process2->GetID(), filter2->routing_id())));
 
@@ skipping 104 matching lines @@
   EXPECT_TRUE(is_fullscreen_allowed(root->child_at(0)));
   EXPECT_TRUE(is_fullscreen_allowed(root->child_at(0)->child_at(0)));
 
   // Cross-site navigation should preserve the fullscreen flags.
   NavigateFrameToURL(root->child_at(0)->child_at(0),
                      embedded_test_server()->GetURL("d.com", "/title1.html"));
   EXPECT_TRUE(is_fullscreen_allowed(root->child_at(0)->child_at(0)));
 }
 
 }  // namespace content