Disable flaky LayerWithRealCompositorTest.ReportMetrics test on windows.

ui/compositor/layer_unittest.cc

Index: ui/compositor/layer_unittest.cc
diff --git a/ui/compositor/layer_unittest.cc b/ui/compositor/layer_unittest.cc
index 0783ff05ba7638b7d8d2c56af285a0dfeb53479b..d06bf13196b94e21798ab0ce3cc863ce80eb70a6 100644
--- a/ui/compositor/layer_unittest.cc
+++ b/ui/compositor/layer_unittest.cc
@@ -2210,9 +2210,17 @@ class TestMetricsReporter : public ui::AnimationMetricsReporter {
   DISALLOW_COPY_AND_ASSIGN(TestMetricsReporter);
 };
 
+// TODO(crbug/709080): LayerWithRealCompositorTest.ReportMetrics is flaky on
+// Windows.
+#if defined(OS_WIN)
+#define MAYBE_ReportMetrics DISABLED_ReportMetrics
+#else
+#define MAYBE_ReportMetrics ReportMetrics
+#endif
+
 // Starts an animation and tests that incrementing compositor frame count can
 // be used to report animation smoothness metrics.
-TEST_F(LayerWithRealCompositorTest, ReportMetrics) {
+TEST_F(LayerWithRealCompositorTest, MAYBE_ReportMetrics) {
   std::unique_ptr<Layer> root(CreateLayer(LAYER_SOLID_COLOR));
   GetCompositor()->SetRootLayer(root.get());
   LayerAnimator* animator = root->GetAnimator();