Disable flaky OffscreenTabsApiTest.OffscreenTabMouseEvents for Win and Linux

chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/common/chrome_switches.h"
 
 // Offscreen Tabs does not work on ChromeOS right now.
 #if !defined(OS_CHROMEOS)
 
 class OffscreenTabsApiTest : public ExtensionApiTest {
  public:
   void SetUpCommandLine(CommandLine* command_line) {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
   }
 };
 
 IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, DISABLED_OffscreenTabBasics) {
   ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs", "crud.html")) << message_;
 }
 
 
-IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabMouseEvents) {
+#if defined (OS_WIN) || defined (OS_LINUX)
+// http://crbug.com/142993 - this times out flakily on Win/Linux
+#define MAYBE_OffscreenTabMouseEvents DISABLED_OffscreenTabMouseEvents
+#else
+#define MAYBE_OffscreenTabMouseEvents OffscreenTabMouseEvents
+#endif
+IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, MAYBE_OffscreenTabMouseEvents) {
   ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs",
                                   "mouse_events.html")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabKeyboardEvents) {
   ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs",
                                   "keyboard_events.html")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabDisplay) {
   ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs",
                                   "display.html")) << message_;
 }
 
 #endif  // #if !defined(OS_CHROMEOS)