increase small allocator limit to encompass compose shader

src/core/SkImagePriv.h

Index: src/core/SkImagePriv.h
diff --git a/src/core/SkImagePriv.h b/src/core/SkImagePriv.h
index 3077f343677d034994846cdb897812258bc0364c..6ce1f83073eb5be56211b2d5828a5200834b9bcf 100644
--- a/src/core/SkImagePriv.h
+++ b/src/core/SkImagePriv.h
@@ -18,7 +18,7 @@ enum SkCopyPixelsMode {
     kNever_SkCopyPixelsMode,      //!< never copy src pixels (even if they are marked mutable)
 };
 
-enum {kSkBlitterContextSize = 3332};
+enum {kSkBlitterContextSize = 5300};  // minimum required for compose shader blitter
 
 // Commonly used allocator. It currently is only used to allocate up to 3 objects. The total
 // bytes requested is calculated using one of our large shaders, its context size plus the size of