Add a parameter GR_ALWAYS_ALLOCATE_ON_HEAP to allow for only ever creating temporary buffers on the…

include/gpu/GrConfig.h

Index: include/gpu/GrConfig.h
diff --git a/include/gpu/GrConfig.h b/include/gpu/GrConfig.h
index c0d90a368040ddae5da739698fd12efe482157d0..80897a07bd17c4af4e85edf7d2be3c6a9ee4dc96 100644
--- a/include/gpu/GrConfig.h
+++ b/include/gpu/GrConfig.h
@@ -232,4 +232,16 @@ typedef unsigned __int64 uint64_t;
     #define GR_STROKE_PATH_RENDERING                 0
 #endif
 
+/**
+ * GR_ALWAYS_ALLOCATE_ON_HEAP determines whether various temporary buffers created
+ * in the GPU backend are always allocated on the heap or are allowed to be
+ * allocated on the stack for smaller memory requests.
+ *
+ * This is only used for memory buffers that are created and then passed through to the
+ * 3D API (e.g. as texture or geometry data)
+ */
+#if !defined(GR_ALWAYS_ALLOCATE_ON_HEAP)
+    #define GR_ALWAYS_ALLOCATE_ON_HEAP 0
+#endif
+
 #endif