Force-generate a frame before the end of a layout test.

content/shell/renderer/layout_test/blink_test_runner.cc

Index: content/shell/renderer/layout_test/blink_test_runner.cc
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index dc4b8e228cb04d50cfcdbb91c469dde6a8fff4c9..1828c87071472a2c2c8d945456dd1b2f3a32d33a 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -587,6 +587,7 @@ void BlinkTestRunner::TestFinished() {
   test_runner::WebTestInterfaces* interfaces =
       LayoutTestRenderThreadObserver::GetInstance()->test_interfaces();
   interfaces->SetTestIsRunning(false);
+  interfaces->TestRunner()->RunPendingAnimations();
   if (interfaces->TestRunner()->ShouldDumpBackForwardList()) {
     SyncNavigationStateVisitor visitor;
     RenderView::ForEach(&visitor);
@@ -876,20 +877,7 @@ void BlinkTestRunner::CaptureDumpContinued() {
     return;
   }
 
-#ifndef NDEBUG
-  // Force a layout/paint by the end of the test to ensure test coverage of
-  // incremental painting.
-  test_runner::LayoutAndPaintAsyncThen(

[chrishtr, 2016/09/19 23:49:38]

@wangxianzhu: this is no longer needed, right?

[Xianzhu, 2016/09/20 02:40:35]

Right. This had been needed before sync painting.

-      render_view()
-          ->GetWebView()
-          ->mainFrame()
-          ->toWebLocalFrame()
-          ->frameWidget(),
-      base::Bind(&BlinkTestRunner::CaptureDumpComplete,
-                 base::Unretained(this)));
-#else
   CaptureDumpComplete();
-#endif
 }
 
 void BlinkTestRunner::OnPixelsDumpCompleted(const SkBitmap& snapshot) {