Add ContextProvider::InvalidateGrContext to reset GL state in GrContext

cc/test/test_in_process_context_provider.cc

Index: cc/test/test_in_process_context_provider.cc
diff --git a/cc/test/test_in_process_context_provider.cc b/cc/test/test_in_process_context_provider.cc
index 3539bd253dbd6072c794e702be3d6cecfab030a6..927986dd85317b05aa575c7836157312f9cf4bd8 100644
--- a/cc/test/test_in_process_context_provider.cc
+++ b/cc/test/test_in_process_context_provider.cc
@@ -124,6 +124,11 @@ class GrContext* TestInProcessContextProvider::GrContext() {
   return gr_context_.get();
 }
 
+void TestInProcessContextProvider::InvalidateGrContext(uint32_t state) {
+  if (gr_context_)
+    gr_context_.get()->resetContext(state);
+}
+
 void TestInProcessContextProvider::SetupLock() {
 }