Implement progress bar spec (determinate and indeterminate).

ui/gfx/animation/linear_animation.cc

Index: ui/gfx/animation/linear_animation.cc
diff --git a/ui/gfx/animation/linear_animation.cc b/ui/gfx/animation/linear_animation.cc
index 7c7327958b2ce2abe61dd5f429667904214b475b..28c338d670ee3890ec2e859439859e5fabdae5f5 100644
--- a/ui/gfx/animation/linear_animation.cc
+++ b/ui/gfx/animation/linear_animation.cc
@@ -17,6 +17,9 @@ using base::TimeDelta;
 
 namespace gfx {
 
+// How many frames per second to target.
+static const int kDefaultFrameRateHz = 60;
+
 static TimeDelta CalculateInterval(int frame_rate) {
   int timer_interval = 1000000 / frame_rate;
   if (timer_interval < 10000)
@@ -24,19 +27,16 @@ static TimeDelta CalculateInterval(int frame_rate) {
   return TimeDelta::FromMicroseconds(timer_interval);
 }
 
-LinearAnimation::LinearAnimation(int frame_rate,
-                                 AnimationDelegate* delegate)
-    : Animation(CalculateInterval(frame_rate)),
-      state_(0.0),
-      in_end_(false) {
-  set_delegate(delegate);
-}
+LinearAnimation::LinearAnimation(int frame_rate, AnimationDelegate* delegate)
+    : LinearAnimation(0, frame_rate, delegate) {}
+
+LinearAnimation::LinearAnimation(AnimationDelegate* delegate)
+    : LinearAnimation(kDefaultFrameRateHz, delegate) {}
 
 LinearAnimation::LinearAnimation(int duration,
                                  int frame_rate,
                                  AnimationDelegate* delegate)
     : Animation(CalculateInterval(frame_rate)),
-      duration_(TimeDelta::FromMilliseconds(duration)),
       state_(0.0),
       in_end_(false) {
   set_delegate(delegate);