Update matrix distance metric to account for snapping.

ui/gfx/transform_util.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_GFX_TRANSFORM_UTIL_H_
 #define UI_GFX_TRANSFORM_UTIL_H_
 
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/gfx_export.h"
 #include "ui/gfx/transform.h"
@@ skipping 47 matching lines @@
 GFX_EXPORT bool SnapTransform(Transform* out,
                               const Transform& transform,
                               const Rect& viewport);
 
 // Calculates a transform with a transformed origin. The resulting tranform is
 // created by composing P * T * P^-1 where P is a constant transform to the new
 // origin.
 GFX_EXPORT Transform TransformAboutPivot(const gfx::Point& pivot,
                                          const gfx::Transform& transform);
 
-// Computes the Frobenius norm of (a - b).
-GFX_EXPORT float MatrixDistance(const Transform& a, const Transform& b);
-
 }  // namespace gfx
 
 #endif  // UI_GFX_TRANSFORM_UTIL_H_