Make Keyframe use TimeTicks/TimeDelta to represent time instead of double.

cc/test/animation_test_common.cc

Index: cc/test/animation_test_common.cc
diff --git a/cc/test/animation_test_common.cc b/cc/test/animation_test_common.cc
index fba316669fdde60797c2f3d81d3858cf89f4f5df..602374f00071275f0e8c8f61cc9e4b62c430e492 100644
--- a/cc/test/animation_test_common.cc
+++ b/cc/test/animation_test_common.cc
@@ -8,6 +8,7 @@
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/transform_operations.h"
+#include "cc/base/time_util.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_impl.h"
 
@@ -35,8 +36,10 @@ int AddOpacityTransition(Target* target,
   if (!use_timing_function)
     func = EaseTimingFunction::Create();
   if (duration > 0.0)
-    curve->AddKeyframe(FloatKeyframe::Create(0.0, start_opacity, func.Pass()));
-  curve->AddKeyframe(FloatKeyframe::Create(duration, end_opacity, nullptr));
+    curve->AddKeyframe(
+        FloatKeyframe::Create(base::TimeDelta(), start_opacity, func.Pass()));
+  curve->AddKeyframe(FloatKeyframe::Create(
+      base::TimeDelta::FromSecondsD(duration), end_opacity, nullptr));
 
   int id = AnimationIdProvider::NextAnimationId();
 
@@ -60,11 +63,12 @@ int AddAnimatedTransform(Target* target,
       curve(KeyframedTransformAnimationCurve::Create());
 
   if (duration > 0.0) {
-    curve->AddKeyframe(
-        TransformKeyframe::Create(0.0, start_operations, nullptr));
+    curve->AddKeyframe(TransformKeyframe::Create(base::TimeDelta(),
+                                                 start_operations, nullptr));
   }
 
-  curve->AddKeyframe(TransformKeyframe::Create(duration, operations, nullptr));
+  curve->AddKeyframe(TransformKeyframe::Create(
+      base::TimeDelta::FromSecondsD(duration), operations, nullptr));
 
   int id = AnimationIdProvider::NextAnimationId();
 
@@ -106,12 +110,14 @@ int AddAnimatedFilter(Target* target,
     FilterOperations start_filters;
     start_filters.Append(
         FilterOperation::CreateBrightnessFilter(start_brightness));
-    curve->AddKeyframe(FilterKeyframe::Create(0.0, start_filters, nullptr));
+    curve->AddKeyframe(
+        FilterKeyframe::Create(base::TimeDelta(), start_filters, nullptr));
   }
 
   FilterOperations filters;
   filters.Append(FilterOperation::CreateBrightnessFilter(end_brightness));
-  curve->AddKeyframe(FilterKeyframe::Create(duration, filters, nullptr));
+  curve->AddKeyframe(FilterKeyframe::Create(
+      base::TimeDelta::FromSecondsD(duration), filters, nullptr));
 
   int id = AnimationIdProvider::NextAnimationId();
 
@@ -137,7 +143,7 @@ base::TimeDelta FakeFloatAnimationCurve::Duration() const {
   return duration_;
 }
 
-float FakeFloatAnimationCurve::GetValue(double now) const {
+float FakeFloatAnimationCurve::GetValue(base::TimeDelta now) const {
   return 0.0f;
 }
 
@@ -155,7 +161,7 @@ base::TimeDelta FakeTransformTransition::Duration() const {
   return duration_;
 }
 
-gfx::Transform FakeTransformTransition::GetValue(double time) const {
+gfx::Transform FakeTransformTransition::GetValue(base::TimeDelta time) const {
   return gfx::Transform();
 }
 
@@ -188,11 +194,11 @@ base::TimeDelta FakeFloatTransition::Duration() const {
   return duration_;
 }
 
-float FakeFloatTransition::GetValue(double time) const {
-  time /= duration_.InSecondsF();
-  if (time >= 1.0)
-    time = 1.0;
-  return (1.0 - time) * from_ + time * to_;
+float FakeFloatTransition::GetValue(base::TimeDelta time) const {
+  double progress = TimeUtil::Divide(time, duration_);
+  if (progress >= 1.0)
+    progress = 1.0;
+  return (1.0 - progress) * from_ + progress * to_;
 }
 
 FakeLayerAnimationValueObserver::FakeLayerAnimationValueObserver()