fix warnings around size_t/int

src/utils/SkMatrix22.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMatrix.h"
+#include "SkMatrix22.h"
 #include "SkPoint.h"
 #include "SkScalar.h"
 
 void SkComputeGivensRotation(const SkVector& h, SkMatrix* G) {
     const SkScalar& a = h.fX;
     const SkScalar& b = h.fY;
     SkScalar c, s;
     if (0 == b) {
         c = SkScalarCopySign(SK_Scalar1, a);
         s = 0;
@@ skipping 11 matching lines @@
     } else {
         SkScalar t = b / a;
         SkScalar u = SkScalarCopySign(SkScalarSqrt(SK_Scalar1 + t*t), a);
         c = SK_Scalar1 / u;
         s = -c * t;
         //r = a * u;
     }
 
     G->setSinCos(s, c);
 }