reset shader compilations for stats

src/gpu/gl/GrGLGpu.h

Index: src/gpu/gl/GrGLGpu.h
diff --git a/src/gpu/gl/GrGLGpu.h b/src/gpu/gl/GrGLGpu.h
index 637a1cf16157af0a0b95f7802f181e6525b179fc..2d05396f87c8f71720b6b71837c533e0bfb2210a 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -128,6 +128,8 @@ public:
     bool isTestingOnlyBackendTexture(GrBackendObject) const override;
     void deleteTestingOnlyBackendTexture(GrBackendObject, bool abandonTexture) const override;
 
+    void resetShaderCacheForTesting() const override;
+
 private:
     GrGLGpu(GrGLContext* ctx, GrContext* context);
 
@@ -213,6 +215,7 @@ private:
         ProgramCache(GrGLGpu* gpu);
         ~ProgramCache();
 
+        void reset();
         void abandon();
         GrGLProgram* refProgram(const DrawArgs&);