Add a class to allocate small objects w/o extra calls to new.

src/core/SkBitmapProcShader.h

Index: src/core/SkBitmapProcShader.h
diff --git a/src/core/SkBitmapProcShader.h b/src/core/SkBitmapProcShader.h
index b7e60f1ca1075e2413e791ced221e1b9de3b3110..36df525af8f9ecc6b469e0e9493f601cccc18b5f 100644
--- a/src/core/SkBitmapProcShader.h
+++ b/src/core/SkBitmapProcShader.h
@@ -12,6 +12,7 @@
 
 #include "SkShader.h"
 #include "SkBitmapProcState.h"
+#include "SkStackAllocator.h"
 
 class SkBitmapProcShader : public SkShader {
 public:
@@ -48,4 +49,11 @@ private:
     typedef SkShader INHERITED;
 };
 
+#define kBlitterStorageByteCount (sizeof(SkBitmapProcShader))
+
+// If alloc is non-NULL, it will be used to allocate the returned SkShader, and MUST outlive
+// the SkShader.
+SkShader* CreateBitmapShader(const SkBitmap& src, SkShader::TileMode, SkShader::TileMode,
+                             SkStackAllocator<kBlitterStorageByteCount>* alloc);
+
 #endif