Compile with VS2015.

samplecode/SampleRegion.cpp

Index: samplecode/SampleRegion.cpp
diff --git a/samplecode/SampleRegion.cpp b/samplecode/SampleRegion.cpp
index 3c5fc2e35cf0ac445c387b6f0373ac959b2b6cfc..80478443071911218151ebd1bdcb80539fbdac39 100644
--- a/samplecode/SampleRegion.cpp
+++ b/samplecode/SampleRegion.cpp
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2011 Google Inc.
  *
@@ -15,6 +14,8 @@
 #include "SkUtils.h"
 #include "SkImageDecoder.h"
 
+#include <math.h>
+
 static void test_strokerect(SkCanvas* canvas) {
     int width = 100;
     int height = 100;
@@ -115,11 +116,6 @@ static void test_text(SkCanvas* canvas) {
     drawFadingText(canvas, str, len, x, y, paint);
 }
 
-#ifdef SK_BUILD_FOR_WIN
-// windows doesn't have roundf
-inline float roundf(float x) { return (x-floor(x))>0.5 ? ceil(x) : floor(x); }
-#endif
-
 #ifdef SK_DEBUG
 static void make_rgn(SkRegion* rgn, int left, int top, int right, int bottom,
                      int count, int32_t runs[]) {