Disable 4 ScreenTimeControllerTest tests

TBR=agawronska@chromium.org

Bug: 1021505
Change-Id: I2138a2e645652a4fc0c1e1ff0bf2babba247b4b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899621Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712548}

chrome/browser/chromeos/child_accounts/screen_time_controller_browsertest.cc

@@ -546,8 +546,9 @@ IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, DefaultBedtime) {
   }
 }
 
+// Disabled because of flakiness crbug.com/1021505
 // Tests the default time window limit.
-IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, DefaultDailyLimit) {
+IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, DISABLED_DefaultDailyLimit) {
   LogInChildAndSetupClockWithTime("1 Jan 2018 10:00:00 GMT");
   ScreenLockerTester().Lock();
 
@@ -612,8 +613,10 @@ IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, DefaultDailyLimit) {
   }
 }
 
+// Disabled because of flakiness crbug.com/1021505
 // Tests that the bedtime locks an active session when it is reached.
-IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, ActiveSessionBedtime) {
+IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest,
+                       DISABLED_ActiveSessionBedtime) {
   LogInChildAndSetupClockWithTime("1 Jan 2018 10:00:00 PST");
 
   system::TimezoneSettings::GetInstance()->SetTimezoneFromID(
@@ -650,8 +653,10 @@ IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, ActiveSessionBedtime) {
   EXPECT_TRUE(IsAuthEnabled());
 }
 
+// Disabled because of flakiness crbug.com/1021505
 // Tests that the daily limit locks the device when it is reached.
-IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, ActiveSessionDailyLimit) {
+IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest,
+                       DISABLED_ActiveSessionDailyLimit) {
   LogInChildAndSetupClockWithTime("1 Jan 2018 10:00:00 PST");
 
   system::TimezoneSettings::GetInstance()->SetTimezoneFromID(
@@ -782,8 +787,9 @@ IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest,
   EXPECT_FALSE(IsAuthEnabled());
 }
 
+// Disabled because of flakiness crbug.com/1021505
 // Tests if call the observers for usage time limit warning.
-IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, CallObservers) {
+IN_PROC_BROWSER_TEST_F(ScreenTimeControllerTest, DISABLED_CallObservers) {
   LogInChildAndSetupClockWithTime("1 Jan 2018 10:00:00 PST");
 
   system::TimezoneSettings::GetInstance()->SetTimezoneFromID(