Deliver IPC messages together with SwapCompositorFrame

content/browser/web_contents/web_contents_impl_browsertest.cc

Index: content/browser/web_contents/web_contents_impl_browsertest.cc
diff --git a/content/browser/web_contents/web_contents_impl_browsertest.cc b/content/browser/web_contents/web_contents_impl_browsertest.cc
index 1f0586cd33dd4a7dcc04181c9f7ee76ed41225d2..14df17d619aa22553ae5891e5fb6586b91d039f1 100644
--- a/content/browser/web_contents/web_contents_impl_browsertest.cc
+++ b/content/browser/web_contents/web_contents_impl_browsertest.cc
@@ -517,5 +517,38 @@ IN_PROC_BROWSER_TEST_F(WebContentsImplBrowserTest, LoadProgress) {
   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() OVERRIDE {
+    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