Make animation longer in 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 5f95f470ffbe11a2405d88b7c0c665131b8d3c17..89fd19a9a74771e38e7c2cefd97b71a28041f550 100644
--- a/ui/compositor/layer_unittest.cc
+++ b/ui/compositor/layer_unittest.cc
@@ -2216,14 +2216,13 @@ class TestMetricsReporter : public ui::AnimationMetricsReporter {
 
 // Starts an animation and tests that incrementing compositor frame count can
 // be used to report animation smoothness metrics.
-// Flaky test crbug.com/709080
-TEST_F(LayerWithRealCompositorTest, DISABLED_ReportMetrics) {
+TEST_F(LayerWithRealCompositorTest, ReportMetrics) {
   std::unique_ptr<Layer> root(CreateLayer(LAYER_SOLID_COLOR));
   GetCompositor()->SetRootLayer(root.get());
   LayerAnimator* animator = root->GetAnimator();
   std::unique_ptr<ui::LayerAnimationElement> animation_element =
       ui::LayerAnimationElement::CreateColorElement(
-          SK_ColorRED, base::TimeDelta::FromMilliseconds(100));
+          SK_ColorRED, base::TimeDelta::FromMilliseconds(1000));
   ui::LayerAnimationSequence* animation_sequence =
       new ui::LayerAnimationSequence(std::move(animation_element));
   TestMetricsReporter reporter;