SkSTArenaAlloc

Syntactic sugar, gets rid of some boilerplate.

Change-Id: Ibdb28b7a8f1d5e4a4e18c12d423b987d7194e340
Reviewed-on: https://skia-review.googlesource.com/17837
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Herb Derby <herb@google.com>
diff --git a/src/utils/SkPatchUtils.cpp b/src/utils/SkPatchUtils.cpp
index 3dc7ba9..5820d85 100644
--- a/src/utils/SkPatchUtils.cpp
+++ b/src/utils/SkPatchUtils.cpp
@@ -326,8 +326,7 @@
         flags |= SkVertices::kHasColors_BuilderFlag;
     }
 
-    char allocStorage[2048];
-    SkArenaAlloc alloc(allocStorage, sizeof(allocStorage));
+    SkSTArenaAlloc<2048> alloc;
     SkRGBAf* cornerColors = srcColors ? alloc.makeArray<SkRGBAf>(4) : nullptr;
     SkRGBAf* tmpColors = srcColors ? alloc.makeArray<SkRGBAf>(vertexCount) : nullptr;
     auto convertCS = interpColorsLinearly ? SkColorSpace::MakeSRGB() : nullptr;