reset shader compilations for stats

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index dd33cff39f166cef5a137208b0783f3ac9c87896..aeaa595f8b6988745d3fdcea264de3915035bb8a 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -397,6 +397,9 @@ public:
     // This is only to be used in GL-specific tests.
     virtual const GrGLContext* glContextForTesting() const { return nullptr; }
 
+    // This is only to be used by testing code
+    virtual void resetShaderCacheForTesting() const {}
+
 protected:
     // Functions used to map clip-respecting stencil tests into normal
     // stencil funcs supported by GPUs.