Promote SkInterpolator unit test to our tests driver.

include/utils/SkInterpolator.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkInterpolator_DEFINED
@@ skipping 95 matching lines @@
 
     /** Return the computed values given the specified time. Return whether
         those values are the result of pinning to either the first
         (kFreezeStart) or last (kFreezeEnd), or from interpolated the two
         nearest key values (kNormal).
         @param time The time to sample (in milliseconds)
         @param (may be null) where to write the computed values.
     */
     Result timeToValues(SkMSec time, SkScalar values[] = NULL) const;
 
-    SkDEBUGCODE(static void UnitTest();)
 private:
     SkScalar* fValues;  // pointer into fStorage
 #ifdef SK_DEBUG
     SkScalar(* fScalarsArray)[10];
 #endif
     typedef SkInterpolatorBase INHERITED;
 };
 
 /** Given all the parameters are [0...1], apply the cubic specified by (0,0)
     (bx,by) (cx,cy) (1,1) to value, returning the answer, also [0...1].
 */
 SkScalar SkUnitCubicInterp(SkScalar value, SkScalar bx, SkScalar by,
                            SkScalar cx, SkScalar cy);
 
 #endif