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 08779b37bf243202d81dcd1024e920050ddd4b58..379d2f347311b54e0a9e762cd96027dc9cdb0c00 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 {
     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);
@@ -71,6 +73,7 @@ public:
 
 protected:
     DOMMatrixReadOnly() {}
+    static void 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.