GrResourceCache2 manages scratch texture.

src/gpu/GrResourceCache2.cpp

Index: src/gpu/GrResourceCache2.cpp
diff --git a/src/gpu/GrResourceCache2.cpp b/src/gpu/GrResourceCache2.cpp
index e0ba26ae83516c54d4e87937bef28607f760b64d..e2322a684e03fa3a336288f11fab4fc66f8403a5 100644
--- a/src/gpu/GrResourceCache2.cpp
+++ b/src/gpu/GrResourceCache2.cpp
@@ -8,7 +8,8 @@
 
 
 #include "GrResourceCache2.h"
-#include "GrGpuResource.h"
+#include "GrGpuResource.h"  
+#include "SkRefCnt.h"
 
 GrResourceCache2::~GrResourceCache2() {
     this->releaseAll();
@@ -55,3 +56,18 @@ void GrResourceCache2::releaseAll() {
     SkASSERT(!fScratchMap.count());
     SkASSERT(!fCount);
 }
+
+class GrResourceCache2::AvailableForScratchUse {
+public:
+    bool operator()(const GrGpuResource* resource) const {
+        // Because duties are currently shared between GrResourceCache and GrResourceCache2, the
+        // current interpretation of this rule is that only GrResourceCache has a ref but that
+        // it has been marked as a scratch resource.
+        return resource->reffedOnlyByCache() && GrIORef::kYes_IsScratch == resource->fIsScratch;
+    }
+};
+
+GrGpuResource* GrResourceCache2::findAndRefScratchResource(const GrResourceKey& scratchKey) {
+    SkASSERT(scratchKey.isScratch());
+    return SkSafeRef(fScratchMap.find(scratchKey, AvailableForScratchUse()));
+}