Add DEPS include rules so we don't accidentally use base

ppapi/tests/test_utils.h

Index: ppapi/tests/test_utils.h
diff --git a/ppapi/tests/test_utils.h b/ppapi/tests/test_utils.h
index a7996b6af4963aaa39b02d7159b830e301019f01..ed5c1af7a0425877da8a8e60cb3ce622fa28658d 100644
--- a/ppapi/tests/test_utils.h
+++ b/ppapi/tests/test_utils.h
@@ -49,4 +49,20 @@ class TestCompletionCallback {
   PP_Instance instance_;
 };
 
+// This is roughly copied from base/compiler_specific.h, and makes it possible
+// to pass 'this' in a constructor initializer list, when you really mean it.
+//
+// Example usage:
+// Foo::Foo(MyInstance* instance)
+//     : ALLOW_THIS_IN_INITIALIZER_LIST(callback_factory_(this)) {}
+#if defined(COMPILER_MSVC)
+#define PP_ALLOW_THIS_IN_INITIALIZER_LIST(code) \
+    __pragma(warning(push)) \
+    __pragma(warning(disable:4355)) \
+    code \
+    __pragma(warning(pop))
+#else
+#define PP_ALLOW_THIS_IN_INITIALIZER_LIST(code) code
+#endif
+
 #endif  // PPAPI_TESTS_TEST_UTILS_H_