Gracefully handle tests finishing simultanously in 2+ secondary windows.

content/shell/renderer/layout_test/blink_test_runner.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/shell/renderer/layout_test/blink_test_runner.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <clocale>
@@ skipping 1014 matching lines @@
   Reset(true /* for_new_test */);
   // Navigating to about:blank will make sure that no new loads are initiated
   // by the renderer.
   WebURLRequest request = WebURLRequest(GURL(url::kAboutBlankURL));
   render_view()->GetWebView()->MainFrame()->LoadRequest(request);
   Send(new ShellViewHostMsg_ResetDone(routing_id()));
 }
 
 void BlinkTestRunner::OnTestFinishedInSecondaryRenderer() {
   DCHECK(is_main_window_ && render_view()->GetMainRenderFrame());
+
+  // Avoid a situation where TestFinished is called twice, because
+  // of a racey test finish in 2 secondary renderers.
+  test_runner::WebTestInterfaces* interfaces =
+      LayoutTestRenderThreadObserver::GetInstance()->test_interfaces();
+  if (!interfaces->TestIsRunning())
+    return;
+
   TestFinished();
 }
 
 void BlinkTestRunner::OnTryLeakDetection() {
   blink::WebFrame* main_frame = render_view()->GetWebView()->MainFrame();
   DCHECK_EQ(GURL(url::kAboutBlankURL), GURL(main_frame->GetDocument().Url()));
   DCHECK(!main_frame->IsLoading());
 
   leak_detector_->TryLeakDetection(main_frame);
 }
@@ skipping 10 matching lines @@
 void BlinkTestRunner::ReportLeakDetectionResult(
     const LeakDetectionResult& report) {
   Send(new ShellViewHostMsg_LeakDetectionDone(routing_id(), report));
 }
 
 void BlinkTestRunner::OnDestruct() {
   delete this;
 }
 
 }  // namespace content