There is a test-only origin trial interface on the internals object -- see third_party/WebKit/Source/core/testing/OriginTrialsTest.idl and friends, installed onto the internals object in third_party/WebKit/Source/core/testing/v8/WebCoreTestSupport.cpp.

We don't have a test-only interface on the global object, if that's what you're looking for. I think we considered it, but decided not to because at the time it was going to require shipping the test interface with the browser, rather than being able to isolate it to content_shell. That may have changed since we made that decision, so we might be able to add one; it would still be installed in WebCoreTestSupport, very similarly to the way that we add interfaces to V8WindowPartial in InstallConditionalFeaturesForModules.

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peria@, would you check if we're calling DidAccessInitialDocument() or not?  Having a test is a separate issue.  I'm concerned about the timing of calling DidAccessInitialDocument().