Implement a benchmark for GrResourceCache

bench/SortBench.cpp

Index: bench/SortBench.cpp
diff --git a/bench/SortBench.cpp b/bench/SortBench.cpp
index 6fb3a71bf9816646189cbf8d7c4575e4d45054e3..161e979776b8a81fa0af4c5e8b1c5e7a2ba9ef87 100644
--- a/bench/SortBench.cpp
+++ b/bench/SortBench.cpp
@@ -104,10 +104,13 @@ class SortBench : public SkBenchmark {
 
 public:
     SortBench(Type t, SortType s) : fType(t), fSortProc(gSorts[s].fProc) {
-        fIsRendering = false;
         fName.printf("sort_%s_%s", gSorts[s].fName, gRec[t].fName);
     }
 
+    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
+        return backend == kNonRendering_Backend;
+    }
+
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         return fName.c_str();