GrResourceCache2 manages scratch texture.

include/gpu/GrTypesPriv.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTypesPriv_DEFINED
 #define GrTypesPriv_DEFINED
 
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         case kInverseFillBW_GrProcessorEdgeType:
             return kFillBW_GrProcessorEdgeType;
         case kInverseFillAA_GrProcessorEdgeType:
             return kFillAA_GrProcessorEdgeType;
         case kHairlineAA_GrProcessorEdgeType:
             SkFAIL("Hairline fill isn't invertible.");
     }
     return kFillAA_GrProcessorEdgeType; // suppress warning.
 }
 
+/**
+ * Indicates the type of pending IO operations that can be recorded for gpu resources.
+ */
+enum GrIOType {
+    kRead_GrIOType,
+    kWrite_GrIOType,
+    kRW_GrIOType
+};
+
 #endif