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

third_party/WebKit/Source/core/testing/Internals.h

Index: third_party/WebKit/Source/core/testing/Internals.h
diff --git a/third_party/WebKit/Source/core/testing/Internals.h b/third_party/WebKit/Source/core/testing/Internals.h
index 1126b602539f38d2982e14c6c50d9f38f66f2507..17c8d6285be9fd81010a54233738d4de64e582f8 100644
--- a/third_party/WebKit/Source/core/testing/Internals.h
+++ b/third_party/WebKit/Source/core/testing/Internals.h
@@ -61,6 +61,7 @@ class LayerRectList;
 class LocalDOMWindow;
 class LocalFrame;
 class Node;
+class OriginTrialsTest;
 class Page;
 class PrivateScriptTest;
 class Range;
@@ -283,6 +284,7 @@ public:
     PrivateScriptTest* privateScriptTest() const;
     DictionaryTest* dictionaryTest() const;
     UnionTypesTest* unionTypesTest() const;
+    OriginTrialsTest* originTrialsTest() const;
 
     Vector<String> getReferencedFilePaths() const;