Modify AnimationEffect::sample() to return a CompositableValue

Modify AnimationEffect::sample() to return a CompositableValue

CompositableValue encapsulates the value which results from applying a set of
composition operations onto an underlying value. It is used to represent the
output of the effect phase of the Web Animations model.

This patch also introduces a stub implementation of AnimatableValue.

It also makes AnimationEffect an interface and moves the current dummy
implementation to DocmentTimelineTest.

BUG=240653
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=150741

[shans, 2013-05-20 23:26:37]

On 2013/05/20 00:24:05, Steve Block wrote:

LGTM, FWIW

[dstockwell, 2013-05-20 23:34:48]

lgtm

[commit-bot: I haz the power, 2013-05-21 03:30:38]

No reviewers yet.

[commit-bot: I haz the power, 2013-05-21 03:36:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/15405006/9001

[commit-bot: I haz the power, 2013-05-21 03:36:05]

Failed to apply patch for Source/core/animation/Animation.cpp:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file Source/core/animation/Animation.cpp
  Hunk #1 FAILED at 63.
  1 out of 1 hunk FAILED -- saving rejects to file
Source/core/animation/Animation.cpp.rej

Patch:       Source/core/animation/Animation.cpp
Index: Source/core/animation/Animation.cpp
diff --git a/Source/core/animation/Animation.cpp
b/Source/core/animation/Animation.cpp
index
43dece2071b86bb280dc81bfcd23058ca55a0786..560ea1522d68f2a457611373fd8a4883fb09882e
100644
--- a/Source/core/animation/Animation.cpp
+++ b/Source/core/animation/Animation.cpp
@@ -63,7 +63,7 @@ TimedItem::ChildAnimationState
Animation::serviceAnimations(double time)
     }
 
     updateTimeFraction(time);
-    m_cachedStyle = m_effect->sample(m_timeFraction, m_currentIteration);
+    m_compositableValues = m_effect->sample(m_currentIteration,
m_timeFraction);
     m_target->setNeedsStyleRecalc(SyntheticStyleChange);
 
     // For now, all animations last 1 second.

[commit-bot: I haz the power, 2013-05-21 03:57:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/steveblock@chromium.org/15405006/19001

[commit-bot: I haz the power, 2013-05-21 05:16:07]

Change committed as 150741