[animations] Adds metrics for jank on selected layer animations

ui/views/animation/square_ink_drop_ripple.cc

Index: ui/views/animation/square_ink_drop_ripple.cc
diff --git a/ui/views/animation/square_ink_drop_ripple.cc b/ui/views/animation/square_ink_drop_ripple.cc
index 64def3348ec3f48bb8847b8f74bba7ef6088d172..e2cb36d5090cea1ed9009f45ed76ea4ea29397d3 100644
--- a/ui/views/animation/square_ink_drop_ripple.cc
+++ b/ui/views/animation/square_ink_drop_ripple.cc
@@ -6,7 +6,9 @@
 
 #include <algorithm>
 
+#include "base/lazy_instance.h"
 #include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_sequence.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
@@ -159,6 +161,15 @@ gfx::Transform CalculateRectTransform(const gfx::Vector2dF& center_offset,
   return transform;
 }
 
+class SquareRippleMetricsReporter : public ui::AnimationMetricsReporter {
+  void Report(int value) override {
+    UMA_HISTOGRAM_PERCENTAGE("Views.AnimationSmoothness.SquareRipple", value);
+  }
+};
+
+base::LazyInstance<SquareRippleMetricsReporter>::Leaky g_reporter =
+    LAZY_INSTANCE_INITIALIZER;
+
 }  // namespace
 
 namespace views {
@@ -459,6 +470,7 @@ void SquareInkDropRipple::AnimateCenterPoint(
   if (observer)
     sequence->AddObserver(observer);
 
+  sequence->SetAnimationMetricsReporter(g_reporter.Pointer());
   animator->StartAnimation(sequence);
 }
 
@@ -482,6 +494,7 @@ void SquareInkDropRipple::AnimateToTransforms(
     if (animation_observer)
       sequence->AddObserver(animation_observer);
 
+    sequence->SetAnimationMetricsReporter(g_reporter.Pointer());
     animator->StartAnimation(sequence);
   }
 }
@@ -513,6 +526,7 @@ void SquareInkDropRipple::AnimateToOpacity(
   if (animation_observer)
     animation_sequence->AddObserver(animation_observer);
 
+  animation_sequence->SetAnimationMetricsReporter(g_reporter.Pointer());
   animator->StartAnimation(animation_sequence);
 }