Prevent will-change:transform from changing the computed value of transform

Source/core/style/ComputedStyle.cpp

Index: Source/core/style/ComputedStyle.cpp
diff --git a/Source/core/style/ComputedStyle.cpp b/Source/core/style/ComputedStyle.cpp
index d240465c8e5c34b9c1efbbed9a847d8b5127c66f..3efea4869d3f70e74b08cfeb423f978325c127ae 100644
--- a/Source/core/style/ComputedStyle.cpp
+++ b/Source/core/style/ComputedStyle.cpp
@@ -893,6 +893,20 @@ bool ComputedStyle::hasWillChangeCompositingHint() const
     return false;
 }
 
+bool ComputedStyle::hasWillChangeTransformHint() const
+{
+    for (size_t i = 0; i < rareNonInheritedData->m_willChange->m_properties.size(); ++i) {

[alancutter (OOO until 2018), 2015/08/29 06:10:04]

Can we use for (const auto& property :
rareNonInheritedData->m_willChange->m_properties) here?

[ajuma, 2015/08/31 16:43:57]

Done.

+        switch (rareNonInheritedData->m_willChange->m_properties[i]) {
+        case CSSPropertyTransform:
+        case CSSPropertyAliasWebkitTransform:
+            return true;
+        default:
+            break;
+        }
+    }
+    return false;
+}
+
 bool ComputedStyle::requireTransformOrigin(ApplyTransformOrigin applyOrigin, ApplyMotionPath applyMotionPath) const
 {
     const Vector<RefPtr<TransformOperation>>& transformOperations = transform().operations();