GeometryInterface: Add DOMMatrixInit and fromMatrix().

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

Index: third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
index cd19086fb95f05e087478c3ee094075bfa73a5c1..182f3ecc17d93342987663da766861c87c31d574 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
+++ b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.h
@@ -15,11 +15,13 @@
 namespace blink {
 
 class DOMMatrix;
+class DOMMatrixInit;
 
-class DOMMatrixReadOnly : public GarbageCollectedFinalized<DOMMatrixReadOnly>, public ScriptWrappable {
+class CORE_EXPORT DOMMatrixReadOnly : public GarbageCollectedFinalized<DOMMatrixReadOnly>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static DOMMatrixReadOnly* create(Vector<double>, ExceptionState&);
+    static DOMMatrixReadOnly* fromMatrix(DOMMatrixInit&, ExceptionState&);
     virtual ~DOMMatrixReadOnly();
 
     double a() const { return m_matrix->m11(); }
@@ -49,7 +51,7 @@ public:
     bool is2D() const;
     bool isIdentity() const;
 
-    DOMMatrix* multiply(DOMMatrix*);
+    DOMMatrix* multiply(DOMMatrixInit&, ExceptionState&);
     DOMMatrix* translate(double tx, double ty, double tz = 0);
     DOMMatrix* scale(double scale, double ox = 0, double oy = 0);
     DOMMatrix* scale3d(double scale, double ox = 0, double oy = 0, double oz = 0);
@@ -72,6 +74,7 @@ public:
 
 protected:
     DOMMatrixReadOnly() {}
+    static bool validateAndFixup(DOMMatrixInit&, ExceptionState&);
     // TransformationMatrix needs to be 16-byte aligned. PartitionAlloc
     // supports 16-byte alignment but Oilpan doesn't. So we use an std::unique_ptr
     // to allocate TransformationMatrix on PartitionAlloc.