More framework support for TransferBuffers

include/gpu/GrTypesPriv.h

Index: include/gpu/GrTypesPriv.h
diff --git a/include/gpu/GrTypesPriv.h b/include/gpu/GrTypesPriv.h
index 6cbd6bb0be3de165bf27d82ea94d086c46258f4d..16e2b0bc56d4468d771296aaf5d2e668bace848f 100644
--- a/include/gpu/GrTypesPriv.h
+++ b/include/gpu/GrTypesPriv.h
@@ -268,6 +268,17 @@ private:
     SkIRect fRect;
 };
 
+/**
+ * Indicates the transfer direction for a transfer buffer
+ */
+enum TransferType {
+    /** Caller intends to use the buffer to transfer data to the GPU */
+    kCpuToGpu_TransferType,
+    /** Caller intends to use the buffer to transfer data from the GPU */
+    kGpuToCpu_TransferType
+};
+
+
 #ifdef SK_DEBUG
 // Takes a pointer to a GrCaps, and will suppress prints if required
 #define GrCapsDebugf(caps, ...)         \