Disable the test case "VerifyHomeLauncherMetrics"

TBR=xdai@chromium.org

Bug: 1126904
Change-Id: I5de8d44012cab485298dcb00804708638e52a949
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527742Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825458}

ash/home_screen/swipe_home_to_overview_controller_unittest.cc

@@ -143,7 +143,8 @@ class SwipeHomeToOverviewControllerTest : public AshTestBase {
 
 // Verify that the metrics of home launcher animation are recorded correctly
 // when entering/exiting overview mode.
-TEST_F(SwipeHomeToOverviewControllerTest, VerifyHomeLauncherMetrics) {
+// The test is flaky (see https://crbug.com/1126904).
+TEST_F(SwipeHomeToOverviewControllerTest, DISABLED_VerifyHomeLauncherMetrics) {
   // Set non-zero animation duration to report animation metrics.
   ui::ScopedAnimationDurationScaleMode non_zero_duration_mode(
       ui::ScopedAnimationDurationScaleMode::NON_ZERO_DURATION);