GrResourceCache2 manages scratch texture.

src/gpu/GrResourceCache2.h

Index: src/gpu/GrResourceCache2.h
diff --git a/src/gpu/GrResourceCache2.h b/src/gpu/GrResourceCache2.h
index e05efd744e44d9e75b157e8c67f9e53648f39fd1..2448da471ab3ff8be58e84d10fb721feb04cac66 100644
--- a/src/gpu/GrResourceCache2.h
+++ b/src/gpu/GrResourceCache2.h
@@ -24,14 +24,17 @@ public:
     GrResourceCache2() : fCount(0) {};
     ~GrResourceCache2();
 
-    void insertResource(GrGpuResource* resource);
+    void insertResource(GrGpuResource*);
 
-    void removeResource(GrGpuResource* resource);
+    void removeResource(GrGpuResource*);
 
     void abandonAll();
 
     void releaseAll();
 
+    GrGpuResource* findAndRefScratchResource(const GrResourceKey& scratchKey,
+                                             uint32_t internalFlags);
+
 private:
 #ifdef SK_DEBUG
     bool isInCache(const GrGpuResource* r) const {
@@ -39,8 +42,8 @@ private:
     }
 #endif
 
+    class AvailableForScratchUse;
 
-    void removeScratch(const GrGpuResource* resource);
     struct ScratchMapTraits {
         static const GrResourceKey& GetKey(const GrGpuResource& r) {
             return r.getScratchKey();