Implement a benchmark for GrResourceCache

bench/XfermodeBench.cpp

Index: bench/XfermodeBench.cpp
diff --git a/bench/XfermodeBench.cpp b/bench/XfermodeBench.cpp
index 0c79cb3fa777ec0092908827c49d115dbd12fb1f..72cfa91e089839181f48e099787df209d023a028 100644
--- a/bench/XfermodeBench.cpp
+++ b/bench/XfermodeBench.cpp
@@ -64,7 +64,10 @@ private:
 class XferCreateBench : public SkBenchmark {
 public:
     XferCreateBench() {
-        fIsRendering = false;
+    }
+
+    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
+        return backend == kNonRendering_Backend;
     }
 
 protected: