[Extensions Bindings] Add a bridge to use current custom bindings

extensions/renderer/api_binding_test.h

Index: extensions/renderer/api_binding_test.h
diff --git a/extensions/renderer/api_binding_test.h b/extensions/renderer/api_binding_test.h
index 8c2d3f8f2b12ad17eda63514065ef4b59206b7fa..d72de47eb12e3812c90e6879a0d4895bd3e1353f 100644
--- a/extensions/renderer/api_binding_test.h
+++ b/extensions/renderer/api_binding_test.h
@@ -26,6 +26,10 @@ class APIBindingTest : public testing::Test {
   APIBindingTest();
   ~APIBindingTest() override;
 
+  // Returns the V8 ExtensionConfiguration to use for contexts. The default
+  // implementation returns null.
+  virtual v8::ExtensionConfiguration* GetV8ExtensionConfiguration();
+
   // testing::Test:
   void SetUp() override;
   void TearDown() override;