Implement animations for Independent CSS Transform Properties

Source/core/animation/KeyframeEffect.cpp

Index: Source/core/animation/KeyframeEffect.cpp
diff --git a/Source/core/animation/KeyframeEffect.cpp b/Source/core/animation/KeyframeEffect.cpp
index fcf364a1ed5817ef5777f49f5131967e6a63eb0a..0912219c7d5ad4f5c9915fcc75ac2b4e3fbce605 100644
--- a/Source/core/animation/KeyframeEffect.cpp
+++ b/Source/core/animation/KeyframeEffect.cpp
@@ -245,6 +245,23 @@ bool KeyframeEffect::isCandidateForAnimationOnCompositor(double animationPlaybac
         || (m_target->computedStyle() && m_target->computedStyle()->hasMotionPath()))
         return false;
 
+    // Put transform operations on compositor iff that single transform
+    // is on ComputedStyle and that is the one being animated because we need
+    // to order the transforms correctly
+    if (m_target->computedStyle()) {
+        unsigned transformCounts = 0;
+        if (m_target->computedStyle()->rotate())
+            transformCounts++;
+        if (m_target->computedStyle()->scale())
+            transformCounts++;
+        if (m_target->computedStyle()->translate())
+            transformCounts++;
+        if (m_target->computedStyle()->hasTransformOperations())
+            transformCounts++;
+        if (transformCounts > 1)
+            return false;
+    }

[Eric Willigers, 2015/06/23 06:50:48]

Does KeyframeEffect::applyEffects() need the same test, to
cancelAnimationOnCompositor in the case a translate/rotate/scale/transform is
set after the composited animation has started?

If so, move the test into a new method.

[soonm, 2015/06/24 00:26:44]

Will move into new methods in a new patch with compositor animations

+
     return CompositorAnimations::instance()->isCandidateForAnimationOnCompositor(specifiedTiming(), *m_target, animation(), *model(), animationPlaybackRate);
 }