Move IOType to GrGpuRef and rename that to GrIORef. Template GrPendingIORef on IOType.

src/gpu/GrGpuResource.cpp

Index: src/gpu/GrGpuResource.cpp
diff --git a/src/gpu/GrGpuResource.cpp b/src/gpu/GrGpuResource.cpp
index a8d7bbf9f50f975d35229d8dee4efdc4d14817a3..bba934e6059e5851721545dc916e49d10024c735 100644
--- a/src/gpu/GrGpuResource.cpp
+++ b/src/gpu/GrGpuResource.cpp
@@ -11,7 +11,7 @@
 #include "GrResourceCache2.h"
 #include "GrGpu.h"
 
-GrGpuRef::~GrGpuRef() {
+GrIORef::~GrIORef() {
     SkASSERT(0 == fRefCnt);
     SkASSERT(0 == fPendingReads);
     SkASSERT(0 == fPendingWrites);