Make SkSmallAllocator obey the RAII invariants and be expandable

tests/Float16Test.cpp

Index: tests/Float16Test.cpp
diff --git a/tests/Float16Test.cpp b/tests/Float16Test.cpp
index 99835686fad361289061ac40f06c1978992fe2af..e1c0930b896382c99ade62f1df5f6ec82f275fc9 100644
--- a/tests/Float16Test.cpp
+++ b/tests/Float16Test.cpp
@@ -6,6 +6,9 @@
  */
 
 #include "Test.h"
+
+#include <cmath>
+
 #include "SkAutoPixmapStorage.h"
 #include "SkColor.h"
 #include "SkHalf.h"
@@ -100,7 +103,7 @@ DEF_TEST(SkFloatToHalf_finite_ftz, r) {
         uint16_t alternate = expected;
         if (is_denorm(expected)) {
             // _finite_ftz() may flush denorms to zero, and happens to keep the sign bit.
-            alternate = signbit(f) ? 0x8000 : 0x0000;
+            alternate = std::signbit(f) ? 0x8000 : 0x0000;

[bungeman-skia, 2016/11/09 19:30:56]

This change seems unrelated?

[herb_g, 2016/11/09 20:20:05]

Removed

         }
 
         uint16_t actual = SkFloatToHalf_finite_ftz(Sk4f{f})[0];