Disable FullscreenElementInSubframe test on Windows due to being flaky.

chrome/browser/site_per_process_interactive_browsertest.cc

 // Copyright 2016 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/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/exclusive_access/fullscreen_controller_test.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 369 matching lines @@
 
 }  // namespace
 
 // Check that an element in a cross-process subframe can enter and exit
 // fullscreen.  The test will verify that:
 // - the subframe is properly resized
 // - the WebContents properly enters/exits fullscreen.
 // - document.webkitFullscreenElement is correctly updated in both frames.
 // - fullscreenchange events fire in both frames.
 // - fullscreen CSS is applied correctly in both frames.
+//
+// Flaky on Windows: https://crbug.com/647311
+#if defined(OS_WIN)
+#define MAYBE_FullscreenElementInSubframe DISABLED_FullscreenElementInSubframe
+#else
+#define MAYBE_FullscreenElementInSubframe FullscreenElementInSubframe
+#endif
 IN_PROC_BROWSER_TEST_F(SitePerProcessInteractiveBrowserTest,
-                       FullscreenElementInSubframe) {
+                       MAYBE_FullscreenElementInSubframe) {
   // Start on a page with one subframe (id "child-0") that has
   // "allowfullscreen" enabled.
   GURL main_url(embedded_test_server()->GetURL(
       "a.com", "/page_with_allowfullscreen_frame.html"));
   ui_test_utils::NavigateToURL(browser(), main_url);
   content::WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
 
   // Navigate the subframe cross-site to a page with a fullscreenable <div>.
   GURL frame_url(
@@ skipping 361 matching lines @@
                                           "document.pointerLockElement)",
                                           &mouse_locked));
   EXPECT_TRUE(mouse_locked);
   EXPECT_TRUE(main_frame->GetView()->IsMouseLocked());
 
   EXPECT_TRUE(ExecuteScript(main_frame,
                             "document.querySelector('iframe').parentNode."
                             "removeChild(document.querySelector('iframe'))"));
   EXPECT_FALSE(main_frame->GetView()->IsMouseLocked());
 }