[Sheriff] Disable flaky test ProcessTests

Disable ProcessTest.SetProcessBackgroundedSelf and
ProcessTest.SetProcessBackgrounded on Windows.

Bug: 931721
TBR=fdoray@chromium.org

Change-Id: Ie5b2882c1d9d39ba5527d610c2a56223e01e74ed
Reviewed-on: https://chromium-review.googlesource.com/c/1470996Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631862}

base/process/process_unittest.cc

@@ -271,7 +271,13 @@ TEST_F(ProcessTest, WaitForExitWithTimeout) {
 // backgrounding and restoring.
 // Note: a platform may not be willing or able to lower the priority of
 // a process. The calls to SetProcessBackground should be noops then.
-TEST_F(ProcessTest, SetProcessBackgrounded) {
+// Flaky on Windows: https://crbug.com/931721.
+#if defined(OS_WIN)
+#define MAYBE_SetProcessBackgrounded DISABLED_SetProcessBackgrounded
+#else
+#define MAYBE_SetProcessBackgrounded SetProcessBackgrounded
+#endif
+TEST_F(ProcessTest, MAYBE_SetProcessBackgrounded) {
   if (!Process::CanBackgroundProcesses())
     return;
   Process process(SpawnChild("SimpleChildProcess"));
@@ -299,9 +305,15 @@ TEST_F(ProcessTest, SetProcessBackgrounded) {
   EXPECT_EQ(old_priority, new_priority);
 }
 
+// Flaky on Windows: https://crbug.com/931721.
+#if defined(OS_WIN)
+#define MAYBE_SetProcessBackgroundedSelf DISABLED_SetProcessBackgroundedSelf
+#else
+#define MAYBE_SetProcessBackgroundedSelf SetProcessBackgroundedSelf
+#endif
 // Same as SetProcessBackgrounded but to this very process. It uses
 // a different code path at least for Windows.
-TEST_F(ProcessTest, SetProcessBackgroundedSelf) {
+TEST_F(ProcessTest, MAYBE_SetProcessBackgroundedSelf) {
   if (!Process::CanBackgroundProcesses())
     return;
   Process process = Process::Current();