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

Source/platform/transforms/IdentityTransformOperation.h

Index: Source/platform/transforms/IdentityTransformOperation.h
diff --git a/Source/platform/transforms/IdentityTransformOperation.h b/Source/platform/transforms/IdentityTransformOperation.h
index 86d143206a676596b257ff134cf49dd8fe012c23..8fa1f66c61622a85a99caafa8c736da995a6c452 100644
--- a/Source/platform/transforms/IdentityTransformOperation.h
+++ b/Source/platform/transforms/IdentityTransformOperation.h
@@ -36,6 +36,11 @@ public:
         return adoptRef(new IdentityTransformOperation());
     }
 
+    virtual bool canBlendWith(const TransformOperation& other) const
+    {
+        return isSameType(other);
+    }
+
 private:
     virtual bool isIdentity() const OVERRIDE FINAL { return true; }
     virtual OperationType type() const OVERRIDE { return Identity; }