Disable flaky ReportMetrics test

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 a9fbea599777680e65b6e75e4d3ee718306db564..5f95f470ffbe11a2405d88b7c0c665131b8d3c17 100644
--- a/ui/compositor/layer_unittest.cc
+++ b/ui/compositor/layer_unittest.cc
@@ -2216,7 +2216,8 @@ class TestMetricsReporter : public ui::AnimationMetricsReporter {
 
 // Starts an animation and tests that incrementing compositor frame count can
 // be used to report animation smoothness metrics.
-TEST_F(LayerWithRealCompositorTest, ReportMetrics) {
+// Flaky test crbug.com/709080
+TEST_F(LayerWithRealCompositorTest, DISABLED_ReportMetrics) {
   std::unique_ptr<Layer> root(CreateLayer(LAYER_SOLID_COLOR));
   GetCompositor()->SetRootLayer(root.get());
   LayerAnimator* animator = root->GetAnimator();