Add Origin Trials Test interface, rather than attaching trials directly to internals.

third_party/WebKit/Source/core/BUILD.gn

Index: third_party/WebKit/Source/core/BUILD.gn
diff --git a/third_party/WebKit/Source/core/BUILD.gn b/third_party/WebKit/Source/core/BUILD.gn
index 3b478b51d2265aadc2b46a46967009412d470cd5..989b79336f34f0bc7c8c1f1d59b106c6b9ba4385 100644
--- a/third_party/WebKit/Source/core/BUILD.gn
+++ b/third_party/WebKit/Source/core/BUILD.gn
@@ -211,10 +211,6 @@ source_set("testing") {
   sources = [
     "$blink_core_output_dir/testing/InternalSettingsGenerated.cpp",
     "$blink_core_output_dir/testing/InternalSettingsGenerated.h",
-    "origin_trials/testing/InternalsFrobulate.cpp",
-    "origin_trials/testing/InternalsFrobulate.h",
-    "origin_trials/testing/InternalsFrobulateInterfaceBindings.h",
-    "origin_trials/testing/WorkerInternalsFrobulate.h",
     "testing/DictionaryTest.cpp",
     "testing/DictionaryTest.h",
     "testing/DummyPageHolder.cpp",
@@ -234,6 +230,9 @@ source_set("testing") {
     "testing/MockHyphenation.h",
     "testing/NullExecutionContext.cpp",
     "testing/NullExecutionContext.h",
+    "testing/OriginTrialsTest.cpp",
+    "testing/OriginTrialsTest.h",
+    "testing/OriginTrialsTestPartial.h",
     "testing/PrivateScriptTest.cpp",
     "testing/PrivateScriptTest.h",
     "testing/TypeConversions.h",