Implement DOMMatrixReadOnly multiple and constructor functions

third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp

Index: third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
index b758a6cf9bbdefdea70c38d7834f979c448873cb..81c0ad52036d7c73c95814b91b40f2598e93c55e 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
+++ b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.cpp
@@ -6,6 +6,35 @@
 
 namespace blink {
 
+DOMMatrixReadOnly* DOMMatrixReadOnly::create(Vector<double> sequence) {
+    if (sequence.size() == 16) {
+       return new DOMMatrixReadOnly(sequence);
+    }
+    return nullptr;
+}
+
+DOMMatrixReadOnly* DOMMatrixReadOnly::create(DOMMatrixReadOnly* other) {
+    return new DOMMatrixReadOnly(other->matrix(), other->is2D());
+}
+
+DOMMatrixReadOnly::DOMMatrixReadOnly(Vector<double> sequence)
+{
+    if (sequence.size() == 16) {
+        m_matrix = TransformationMatrix::create(
+                sequence[0], sequence[1], sequence[2], sequence[3],
+                sequence[4], sequence[5], sequence[6], sequence[7],
+                sequence[8], sequence[9], sequence[10], sequence[11],
+                sequence[12], sequence[13], sequence[14], sequence[15]);
+        m_is2D = false;
+    }
+}
+
+DOMMatrixReadOnly::DOMMatrixReadOnly(const TransformationMatrix& matrix, bool is2D)
+{
+    m_matrix = TransformationMatrix::create(matrix);
+    m_is2D = is2D;
+}
+
 DOMMatrixReadOnly::~DOMMatrixReadOnly()
 {
 }
@@ -20,9 +49,11 @@ bool DOMMatrixReadOnly::isIdentity() const
     return m_matrix->isIdentity();
 }
 
-DOMMatrix* DOMMatrixReadOnly::multiply(DOMMatrix* other)
+DOMMatrixReadOnly* DOMMatrixReadOnly::multiply(DOMMatrixReadOnly* other)
 {
-    return DOMMatrix::create(this)->multiplySelf(other);
+    TransformationMatrix m = this->matrix();
+    m.multiply(other->matrix());
+    return new DOMMatrixReadOnly(m, other->is2D());
 }
 
 DOMMatrix* DOMMatrixReadOnly::translate(double tx, double ty, double tz)