Adding Blink-side 3d Box and Bounds calculations to TransformOperations

Source/platform/transforms/PerspectiveTransformOperation.h

Index: Source/platform/transforms/PerspectiveTransformOperation.h
diff --git a/Source/platform/transforms/PerspectiveTransformOperation.h b/Source/platform/transforms/PerspectiveTransformOperation.h
index e2de31de9b372c9290e365468300a64c06f35995..59ab8ee487e49fecdfd923ac6fc5a24f469fdbf6 100644
--- a/Source/platform/transforms/PerspectiveTransformOperation.h
+++ b/Source/platform/transforms/PerspectiveTransformOperation.h
@@ -39,6 +39,11 @@ public:
 
     double perspective() const { return m_p; }
 
+    virtual bool canBlendWith(const TransformOperation& other) const
+    {
+        return isSameType(other);
+    }
+
 private:
     virtual bool isIdentity() const OVERRIDE { return !m_p; }
     virtual OperationType type() const OVERRIDE { return Perspective; }