Make sure new render is used when navigating away from about:blank in WebUI renderer.

content/browser/frame_host/render_frame_host_manager_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 <set>
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
@@ skipping 1455 matching lines @@
 
   // Navigate to url1 and check bindings.
   NavigateToURL(new_shell, url1);
   // The navigation should have used the first SiteInstance, otherwise
   // |initial_rvh| did not have a chance to be used.
   EXPECT_EQ(new_web_contents->GetSiteInstance(), site_instance1);
   EXPECT_EQ(BINDINGS_POLICY_WEB_UI,
       new_web_contents->GetRenderViewHost()->GetEnabledBindings());
 }
 
+IN_PROC_BROWSER_TEST_F(
+    RenderFrameHostManagerTest,
+    NavigationFromWebUIToRegularPageInterleavedWithBlankPageProcessPerTab) {

[Charlie Reis, 2014/10/20 19:37:54]

Can we come up with a shorter test name, like ForceSwapDueToWebUIBindings?

It also helps to put the bug number in a comment above the test, so that it's
easy to spot the reason this is important (in case the test later fails for
someone).

[Krzysztof Olczyk, 2014/10/21 08:27:05]

Done. I called it ForceSwapAfterWebUIBindings as I would like to
highlight it is about leaving (as opposed to entering) WebUI renderer.

+  CommandLine::ForCurrentProcess()->AppendSwitch(switches::kProcessPerTab);
+  ASSERT_TRUE(test_server()->Start());
+
+  const GURL web_ui_url(std::string(kChromeUIScheme) + "://" +
+                        std::string(kChromeUIGpuHost));
+  NavigateToURL(shell(), web_ui_url);
+  EXPECT_TRUE(ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
+                  shell()->web_contents()->GetRenderProcessHost()->GetID()));
+
+  NavigateToURL(shell(), GURL(url::kAboutBlankURL));
+
+  GURL regular_page_url(test_server()->GetURL("files/title2.html"));
+  NavigateToURL(shell(), regular_page_url);
+  EXPECT_FALSE(ChildProcessSecurityPolicyImpl::GetInstance()->HasWebUIBindings(
+                   shell()->web_contents()->GetRenderProcessHost()->GetID()));
+}
+
 }  // namespace content