GeometryInterface: Add DOMMatrixInit and fromMatrix().

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

Index: third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.idl
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.idl b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.idl
index 2051403533645fe694c8cf637fbbd818b80049f5..472fa33b1b9a5fd9b4b3d465adaf69de6a79a6fd 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.idl
+++ b/third_party/WebKit/Source/core/dom/DOMMatrixReadOnly.idl
@@ -12,6 +12,7 @@
 ] interface DOMMatrixReadOnly {
     [RaisesException, NewObject] static DOMMatrixReadOnly fromFloat32Array(Float32Array array32);
     [RaisesException, NewObject] static DOMMatrixReadOnly fromFloat64Array(Float64Array array64);
+    [RaisesException, NewObject] static DOMMatrixReadOnly fromMatrix(optional DOMMatrixInit other);
 
     // These attributes are simple aliases for certain elements of the 4x4 matrix
     readonly attribute unrestricted double a;
@@ -41,7 +42,11 @@
     readonly attribute boolean is2D;
     readonly attribute boolean isIdentity;
 
-    // FIXME: Should implement some methods (See: crbug.com/388780)
+    // TODO(zino): Should implement rotate() method (See: crbug.com/645878)
+    // TODO(zino): Should implement rotateFromVector() method (See: crbug.com/645882)
+    // TODO(zino): Should implement rotateAxisAngle() method (See: crbug.com/645883)
+    // TODO(zino): Should implement transformPoint() method (See: crbug.com/645885)
+    // TODO(zino): Should remove scaleNonUniform() method (See: crbug.com/645887)
     // Immutable transform methods
     DOMMatrix translate(unrestricted double tx,
                         unrestricted double ty,
@@ -59,9 +64,9 @@
                               optional unrestricted double originX = 0,
                               optional unrestricted double originY = 0,
                               optional unrestricted double originZ = 0);
-    DOMMatrix multiply(DOMMatrix other);
     DOMMatrix skewX(optional unrestricted double sx = 0);
     DOMMatrix skewY(optional unrestricted double sy = 0);
+    [RaisesException] DOMMatrix multiply(optional DOMMatrixInit other);
     DOMMatrix flipX();
     DOMMatrix flipY();
     DOMMatrix inverse();