Disable SequenceManagerFuzzerProcessorTest test on Linux.

Bug: 875170
TBR: altimin@chromium.org
Change-Id: Ibf452c3fd02fba616e58d7fe9fb4377684126f67
Reviewed-on: https://chromium-review.googlesource.com/1180495Reviewed-by: apacible <apacible@chromium.org>
Commit-Queue: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584247}

third_party/blink/renderer/platform/scheduler/base/sequence_manager_fuzzer_processor_unittest.cc

@@ -7,6 +7,7 @@
 #include <memory>
 
 #include "base/strings/strcat.h"
+#include "build/build_config.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/blink/renderer/platform/scheduler/base/proto/sequence_manager_test_description.pb.h"
@@ -1237,7 +1238,13 @@ TEST(SequenceManagerFuzzerProcessorTest, CreateThreadRecursively) {
   EXPECT_THAT(executed_actions, ContainerEq(expected_actions));
 }
 
-TEST(SequenceManagerFuzzerProcessorTest, PostTaskToCreateThread) {
+// Disabled since this test is flaky on Linux. https://crbug.com/875170.
+#if defined(OS_LINUX)
+#define MAYBE_PostTaskToCreateThread DISABLED_PostTaskToCreateThread
+#else
+#define MAYBE_PostTaskToCreateThread PostTaskToCreateThread
+#endif
+TEST(SequenceManagerFuzzerProcessorTest, MAYBE_PostTaskToCreateThread) {
   std::vector<std::vector<ActionForTest>> executed_actions;
   std::vector<std::vector<TaskForTest>> executed_tasks;