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

src/core/SkCoreBlitters.h

Index: src/core/SkCoreBlitters.h
diff --git a/src/core/SkCoreBlitters.h b/src/core/SkCoreBlitters.h
index 1605a5273dcd7c2496fb65af8d741d7728cd8620..8b49c388177c3a30c12f90cf6b8b80b09944be19 100644
--- a/src/core/SkCoreBlitters.h
+++ b/src/core/SkCoreBlitters.h
@@ -8,8 +8,11 @@
 #ifndef SkCoreBlitters_DEFINED
 #define SkCoreBlitters_DEFINED
 
+#include "SkBitmapProcShader.h"
 #include "SkBlitter.h"
 #include "SkBlitRow.h"
+#include "SkShader.h"
+#include "SkStackAllocator.h"
 
 class SkRasterBlitter : public SkBlitter {
 public:
@@ -175,8 +178,7 @@ private:
     SkBlitter::Choose(...)
  */
 
-extern SkBlitter* SkBlitter_ChooseD565(const SkBitmap& device,
-                                       const SkPaint& paint,
-                                       void* storage, size_t storageSize);
+SkBlitter* SkBlitter_ChooseD565(const SkBitmap& device, const SkPaint& paint,
+                                SkTBlitterAllocator* allocator);
 
 #endif