Animations: Allow document animation timelines to have a playback rate

Source/core/animation/AnimationTimeline.h

Index: Source/core/animation/AnimationTimeline.h
diff --git a/Source/core/animation/AnimationTimeline.h b/Source/core/animation/AnimationTimeline.h
index 52650095c14df569cc17fceac1dabafa537f00c3..9e29f3482f82dcd7c787d2729a1bd3fc750ccbc6 100644
--- a/Source/core/animation/AnimationTimeline.h
+++ b/Source/core/animation/AnimationTimeline.h
@@ -91,6 +91,9 @@ public:
     void setOutdatedAnimationPlayer(AnimationPlayer*);
     bool hasOutdatedAnimationPlayer() const;
 
+    void setPlaybackRateForInspector(double);

[dstockwell, 2014/11/12 03:39:42]

remove "ForInspector" this should be a general feature

[samli, 2014/11/12 20:01:13]

Done.

+    double playbackRateForInspector() const;
+
     Document* document() { return m_document.get(); }
 #if !ENABLE(OILPAN)
     void detachFromDocument();
@@ -110,6 +113,11 @@ private:
     WillBeHeapHashSet<RefPtrWillBeMember<AnimationPlayer>> m_playersNeedingUpdate;
     WillBeHeapHashSet<RawPtrWillBeWeakMember<AnimationPlayer>> m_players;
 
+    // Inspector variables

[dstockwell, 2014/11/12 03:39:42]

Don't know what these are for.

[samli, 2014/11/12 20:01:13]

Done.

+    double m_lastCurrentTime;
+    double m_lastRealTime;

[alancutter (OOO until 2018), 2014/11/12 03:19:18]

These names are quite unclear. It's hard to think of a good name so perhaps a
comment here explaining what these member variables are would suffice.

[samli, 2014/11/12 20:01:13]

Done.

+    double m_playbackRate;
+
     friend class SMILTimeContainer;
     static const double s_minimumDelay;