Disable flaky FlashFullscreen*.FullscreenFromSubframe test on Linux.

chrome/browser/ui/exclusive_access/flash_fullscreen_interactive_browsertest.cc

 // Copyright 2014 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/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 286 matching lines @@
                        FullscreenWithinTab_EscapeKeyExitsFullscreen) {
   ASSERT_TRUE(ui_test_utils::BringBrowserWindowToFront(browser()));
   StartFakingTabCapture();
   ASSERT_TRUE(LaunchFlashFullscreen());
   content::WebContents* const first_tab_contents = GetActiveWebContents();
   EXPECT_TRUE(ObserveFlashHasFocus(first_tab_contents, true));
   PressEscape();
   EXPECT_TRUE(ObserveTabIsInFullscreen(false));
 }
 
+// Flaky on Linux, see https://crbug.com/648406.
+#if defined(OS_LINUX)
+#define MAYBE_FullscreenFromSubframe DISABLED_FullscreenFromSubframe
+#else
+#define MAYBE_FullscreenFromSubframe FullscreenFromSubframe
+#endif
 IN_PROC_BROWSER_TEST_F(FlashFullscreenInteractiveBrowserTest,
-                       FullscreenFromSubframe) {
+                       MAYBE_FullscreenFromSubframe) {
   ASSERT_TRUE(ui_test_utils::BringBrowserWindowToFront(browser()));
   StartFakingTabCapture();
   ASSERT_TRUE(LaunchFlashFullscreenInSubframe());
   content::WebContents* const first_tab_contents = GetActiveWebContents();
   EXPECT_TRUE(ObserveFlashHasFocus(first_tab_contents, true));
   PressEscape();
   EXPECT_TRUE(ObserveTabIsInFullscreen(false));
 }
 
 // This tests that browser UI focus behavior is correct when switching between
@@ skipping 72 matching lines @@
   ASSERT_TRUE(ObserveFlashFillColor(SK_ColorRED));
   PressSpacebar();
   ASSERT_TRUE(ObserveFlashFillColor(SK_ColorBLUE));
 
   // Test that the Escape key is handled as an exit fullscreen command while the
   // Flash widget has the focus.
   EXPECT_TRUE(ObserveFlashHasFocus(first_tab_contents, true));
   PressEscape();
   EXPECT_TRUE(ObserveTabIsInFullscreen(false));
 }