Invalidate first line display item clients when first line style changes

third_party/WebKit/LayoutTests/fast/css/first-line-hover-001.html

Index: third_party/WebKit/LayoutTests/fast/css/first-line-hover-001.html
diff --git a/third_party/WebKit/LayoutTests/fast/css/first-line-hover-001.html b/third_party/WebKit/LayoutTests/fast/css/first-line-hover-001.html
index 5e7c9097b854f9a26815009eab665844bd186299..31b5424fc8b7d055a6ffeaabe3e55e4e1acac1fd 100644
--- a/third_party/WebKit/LayoutTests/fast/css/first-line-hover-001.html
+++ b/third_party/WebKit/LayoutTests/fast/css/first-line-hover-001.html
@@ -9,11 +9,11 @@
         <p>This text should have a green background when hovered.</p>
     </div>
 </div>
+<script src="../../resources/run-after-layout-and-paint.js"></script>
 <script>
-document.body.offsetTop; // Force layout. The mouse is not tracked before first layout.
-
-if (window.eventSender)
+runAfterlayoutAndPaint(function() {
+  if (window.eventSender)
     eventSender.mouseMoveTo(100, 100); // Hover.
-
-document.body.offsetTop; // Update layout for the hovered state.
+  document.body.offsetTop; // Update layout for the hovered state.
+}, true);
 </script>