Add localToAbsoluteTransform and localToAncestorTransform.

third_party/WebKit/Source/platform/geometry/TransformState.cpp

Index: third_party/WebKit/Source/platform/geometry/TransformState.cpp
diff --git a/third_party/WebKit/Source/platform/geometry/TransformState.cpp b/third_party/WebKit/Source/platform/geometry/TransformState.cpp
index 9ec2073661391dd75f49b5aa40f7459213729c7b..03c9746f0072302a0c08219222d1f0b7d8683552 100644
--- a/third_party/WebKit/Source/platform/geometry/TransformState.cpp
+++ b/third_party/WebKit/Source/platform/geometry/TransformState.cpp
@@ -68,6 +68,9 @@ void TransformState::translateMappedCoordinates(const LayoutSize& offset)
 
 void TransformState::move(const LayoutSize& offset, TransformAccumulation accumulate)
 {
+    if (m_forceAccumulatingTransform)
+        accumulate = AccumulateTransform;
+
     if (accumulate == FlattenTransform || !m_accumulatedTransform) {
         m_accumulatedOffset += offset;
     } else {
@@ -108,6 +111,9 @@ void TransformState::applyTransform(const TransformationMatrix& transformFromCon
     if (wasClamped)
         *wasClamped = false;
 
+    if (m_forceAccumulatingTransform)
+        accumulate = AccumulateTransform;
+
     if (transformFromContainer.isIntegerTranslation()) {
         move(LayoutSize(LayoutUnit(transformFromContainer.e()), LayoutUnit(transformFromContainer.f())), accumulate);
         return;
@@ -135,6 +141,7 @@ void TransformState::applyTransform(const TransformationMatrix& transformFromCon
 
 void TransformState::flatten(bool* wasClamped)
 {
+    ASSERT(!m_forceAccumulatingTransform);
     if (wasClamped)
         *wasClamped = false;
 
@@ -180,6 +187,12 @@ FloatQuad TransformState::mappedQuad(bool* wasClamped) const
     return m_accumulatedTransform->inverse().projectQuad(quad, wasClamped);
 }
 
+const TransformationMatrix& TransformState::accumulatedTransform() const
+{
+    ASSERT(m_forceAccumulatingTransform && m_accumulatingTransform);
+    return *m_accumulatedTransform;
+}
+
 void TransformState::flattenWithTransform(const TransformationMatrix& t, bool* wasClamped)
 {
     if (m_direction == ApplyTransformDirection) {