[GeometryInterface] parameter of translate*() was changed.

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // http://dev.w3.org/fxtf/geometry/#DOMMatrix
 
 [
     Constructor,
     Constructor(DOMMatrixReadOnly other),
     Constructor(sequence<unrestricted double> numberSequence),
@@ skipping 32 matching lines @@
     inherit attribute unrestricted double m44;
 
     // TODO(zino): Should implement rotateSelf() method (See: crbug.com/645878)
     // TODO(zino): Should implement rotateFromVectorSelf() method (See: crbug.com/645882)
     // TODO(zino): Should implement rotateAxisAngleSelf() method (See: crbug.com/645883)
     // TODO(zino): Should implement setMatrixValue() method (See: crbug.com/645884)
     // TODO(zino): Should remove scaleNonUniformSelf() method (See: crbug.com/645887)
     // Mutable transform methods
     [RaisesException] DOMMatrix multiplySelf(optional DOMMatrixInit other);
     [RaisesException] DOMMatrix preMultiplySelf(optional DOMMatrixInit other);
-    DOMMatrix translateSelf(unrestricted double tx,
-                            unrestricted double ty,
+    DOMMatrix translateSelf(optional unrestricted double tx = 0,
+                            optional unrestricted double ty = 0,
                             optional unrestricted double tz = 0);
     DOMMatrix scaleSelf(optional unrestricted double scaleX = 1,
                         optional unrestricted double scaleY,
                         optional unrestricted double scaleZ = 1,
                         optional unrestricted double originX = 0,
                         optional unrestricted double originY = 0,
                         optional unrestricted double originZ = 0);
     DOMMatrix scale3dSelf(unrestricted double scale,
                           optional unrestricted double originX = 0,
                           optional unrestricted double originY = 0,
                           optional unrestricted double originZ = 0);
     DOMMatrix rotateSelf(optional unrestricted double rotX = 0,
                           optional unrestricted double rotY,
                           optional unrestricted double rotZ);
     DOMMatrix rotateFromVectorSelf(optional unrestricted double x = 0,
                                   optional unrestricted double y = 0);
     DOMMatrix rotateAxisAngleSelf(optional unrestricted double x = 0,
                                   optional unrestricted double y = 0,
                                   optional unrestricted double z = 0,
                                   optional unrestricted double angle = 0);
     DOMMatrix skewXSelf(optional unrestricted double sx = 0);
     DOMMatrix skewYSelf(optional unrestricted double sy = 0);
     DOMMatrix invertSelf();
 
     [RaisesException] DOMMatrix setMatrixValue(DOMString transformList);
 };