[PPAPI] Disable flaky browsertest Graphics2D_FlushOffscreenUpdate

chrome/test/ppapi/ppapi_browsertest.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 <stddef.h>
 
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
 #include "build/build_config.h"
@@ skipping 233 matching lines @@
 // TODO(jhorwich) Enable when Graphics2D_Dev interfaces are proxied in NaCl.
 TEST_PPAPI_NACL(Graphics2D_InvalidResource)
 TEST_PPAPI_NACL(Graphics2D_InvalidSize)
 TEST_PPAPI_NACL(Graphics2D_Humongous)
 TEST_PPAPI_NACL(Graphics2D_InitToZero)
 TEST_PPAPI_NACL(Graphics2D_Describe)
 TEST_PPAPI_NACL(Graphics2D_Paint)
 TEST_PPAPI_NACL(Graphics2D_Scroll)
 TEST_PPAPI_NACL(Graphics2D_Replace)
 TEST_PPAPI_NACL(Graphics2D_Flush)
-TEST_PPAPI_NACL(Graphics2D_FlushOffscreenUpdate)
+// TODO(crbug.com/682275): Flaky on Ubuntu.
+// TEST_PPAPI_NACL(Graphics2D_FlushOffscreenUpdate)
 TEST_PPAPI_NACL(Graphics2D_BindNull)
 
 #if defined(OS_WIN)
 #if defined(USE_AURA)
 // These tests fail with the test compositor which is what's used by default for
 // browser tests on Windows Aura. Renable when the software compositor is
 // available.
 #define MAYBE_OUT_Graphics3D DISABLED_Graphics3D
 #define MAYBE_NACL_Graphics3D DISABLED_Graphics3D
 #else  // defined(USE_AURA)
@@ skipping 1060 matching lines @@
                        MAYBE_PPAPI_NACL(NoSocketPermissions)) {
   RunTests("no_socket_permissions");
 }
 
 IN_PROC_BROWSER_TEST_F(NewlibPackagedAppTest,
                        MAYBE_PPAPI_NACL(SocketPermissions)) {
   RunTests("socket_permissions");
 }
 
 #endif