Defer starting of animations until after compositing update

Source/core/animation/AnimationClock.cpp

Index: Source/core/animation/AnimationClock.cpp
diff --git a/Source/core/svg/SVGAnimatedNumber.cpp b/Source/core/animation/AnimationClock.cpp
similarity index 77%
copy from Source/core/svg/SVGAnimatedNumber.cpp
copy to Source/core/animation/AnimationClock.cpp
index 9c1fc971a5258560fec9bd76b7e2576de468a062..649220690e67a27adf18592ac5d9a46d000c9ff2 100644
--- a/Source/core/svg/SVGAnimatedNumber.cpp
+++ b/Source/core/animation/AnimationClock.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2014 Google Inc. All rights reserved.
+ * Copyright (c) 2014, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -29,21 +29,25 @@
  */
 
 #include "config.h"
-
-#include "core/svg/SVGAnimatedNumber.h"
-#include "core/svg/SVGAnimatedNumberOptionalNumber.h"
+#include "core/animation/AnimationClock.h"
 
 namespace WebCore {
 
-void SVGAnimatedNumber::synchronizeAttribute()
+void AnimationClock::updateTime(double time)
 {
-    ASSERT(needsSynchronizeAttribute());
-    if (m_parentNumberOptionalNumber) {
-        m_parentNumberOptionalNumber->synchronizeAttribute();
-        return;
-    }
+    if (time > m_time)
+        m_time = time;
+    m_frozen = true;
+}
 
-    NewSVGAnimatedProperty<SVGNumber>::synchronizeAttribute();
+double AnimationClock::currentTime()
+{
+    if (!m_frozen) {
+        double newTime = m_monotonicallyIncreasingTime();
+        if (newTime >= m_time + minTimeBeforeUnsynchronizedAnimationClockTick)
+            m_time = newTime;
+    }
+    return m_time;
 }
 
 }