Create an interactive site-per-process browsertest class and move DocumentHasFocus there.

content/public/test/browser_test_utils.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 #define CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 
 #include <queue>
 #include <string>
 #include <vector>
@@ skipping 217 matching lines @@
 // no frames match the specified predicate, or if more than one frame matches.
 RenderFrameHost* FrameMatchingPredicate(
     WebContents* web_contents,
     const base::Callback<bool(RenderFrameHost*)>& predicate);
 
 // Predicates for use with FrameMatchingPredicate.
 bool FrameMatchesName(const std::string& name, RenderFrameHost* frame);
 bool FrameIsChildOfMainFrame(RenderFrameHost* frame);
 bool FrameHasSourceUrl(const GURL& url, RenderFrameHost* frame);
 
+// Finds the child frame at the specified |index| for |frame| and returns its
+// RenderFrameHost.  Returns nullptr if such child frame does not exist.
+RenderFrameHost* ChildFrameAt(RenderFrameHost* frame, size_t index);
+
 // Executes the WebUI resource test runner injecting each resource ID in
 // |js_resource_ids| prior to executing the tests.
 //
 // Returns true if tests ran successfully, false otherwise.
 bool ExecuteWebUIResourceTest(WebContents* web_contents,
                               const std::vector<int>& js_resource_ids);
 
 // Returns the cookies for the given url.
 std::string GetCookies(BrowserContext* browser_context, const GURL& url);
 
@@ skipping 253 matching lines @@
   blink::WebInputEvent::Type wait_for_type_;
   uint32_t ack_result_;
   base::Closure quit_;
 
   DISALLOW_COPY_AND_ASSIGN(InputMsgWatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_