Add ContextProvider::InvalidateGrContext to reset GL state in GrContext

cc/test/test_context_provider.h

Index: cc/test/test_context_provider.h
diff --git a/cc/test/test_context_provider.h b/cc/test/test_context_provider.h
index 9dd7b62a1c3a8244804a327effd117191b7548e8..54b2ed5e36c015b6fd068a4dc8ccea253b35a988 100644
--- a/cc/test/test_context_provider.h
+++ b/cc/test/test_context_provider.h
@@ -34,6 +34,7 @@ class TestContextProvider : public ContextProvider {
   gpu::gles2::GLES2Interface* ContextGL() override;
   gpu::ContextSupport* ContextSupport() override;
   class GrContext* GrContext() override;
+  void InvalidateGrContext(uint32_t state) override;
   void SetupLock() override;
   base::Lock* GetLock() override;
   bool IsContextLost() override;