Deliver IPC messages together with SwapCompositorFrame

content/browser/web_contents/web_contents_impl_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 "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/browser/web_contents/web_contents_view.h"
 #include "content/public/browser/load_notification_details.h"
@@ skipping 499 matching lines @@
     ADD_FAILURE() << "Progress values should be in order: "
                   << ::testing::PrintToString(progresses);
   }
 
   // ... and the last one should be 1.0, meaning complete.
   ASSERT_GE(progresses.size(), 1U)
       << "There should be at least one progress update";
   EXPECT_EQ(1.0, *progresses.rbegin());
 }
 
+struct FirstVisuallyNonEmptyPaintObserver : public WebContentsObserver {
+  FirstVisuallyNonEmptyPaintObserver(Shell* shell)
+      : WebContentsObserver(shell->web_contents()),
+        did_fist_visually_non_empty_paint_(false) {}
+
+  virtual void DidFirstVisuallyNonEmptyPaint() {
+    did_fist_visually_non_empty_paint_ = true;
+    on_did_first_visually_non_empty_paint_.Run();
+  }
+
+  void WaitForDidFirstVisuallyNonEmptyPaint() {
+    if (did_fist_visually_non_empty_paint_)
+      return;
+    base::RunLoop run_loop;
+    on_did_first_visually_non_empty_paint_ = run_loop.QuitClosure();
+    run_loop.Run();
+  }
+
+  base::Closure on_did_first_visually_non_empty_paint_;
+  bool did_fist_visually_non_empty_paint_;
+};
+
+IN_PROC_BROWSER_TEST_F(WebContentsImplBrowserTest, FirstVisuallyNonEmptyPaint) {
+  ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
+  scoped_ptr<FirstVisuallyNonEmptyPaintObserver> observer(
+      new FirstVisuallyNonEmptyPaintObserver(shell()));
+
+  NavigateToURL(shell(), embedded_test_server()->GetURL("/title1.html"));
+
+  observer->WaitForDidFirstVisuallyNonEmptyPaint();
+  ASSERT_TRUE(observer->did_fist_visually_non_empty_paint_);
+}
+
 }  // namespace content