Makes window focused for gpu pixel test

chrome/test/gpu/gpu_pixel_browsertest.cc

Index: chrome/test/gpu/gpu_pixel_browsertest.cc
diff --git a/chrome/test/gpu/gpu_pixel_browsertest.cc b/chrome/test/gpu/gpu_pixel_browsertest.cc
index 26288f7f8dc934d613ad5acb3159490fa80910b2..cfaeef756c07bacc90bdf07ba213d3b2366a9f83 100644
--- a/chrome/test/gpu/gpu_pixel_browsertest.cc
+++ b/chrome/test/gpu/gpu_pixel_browsertest.cc
@@ -312,6 +312,8 @@ IN_PROC_BROWSER_TEST_F(GpuPixelBrowserTest, MAYBE_WebGLTeapot) {
   gfx::Size container_size(500, 500);
   ResizeTabContainer(browser(), container_size);
 
+  ASSERT_TRUE(ui_test_utils::BringBrowserWindowToFront(browser()));
+
   ui_test_utils::DOMMessageQueue message_queue;
   ui_test_utils::NavigateToURL(
       browser(),