diff --git a/runtime/experimental_flags.h b/runtime/experimental_flags.h
new file mode 100644
index 0000000..2e674e9
--- /dev/null
+++ b/runtime/experimental_flags.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
+#define ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
+
+#include <ostream>
+
+namespace art {
+
+// Possible experimental features that might be enabled.
+struct ExperimentalFlags {
+  // The actual flag values.
+  enum {
+    kNone           = 0x0000,
+    kLambdas        = 0x0001,
+    kDefaultMethods = 0x0002,
+  };
+
+  constexpr ExperimentalFlags() : value_(0x0000) {}
+  constexpr ExperimentalFlags(decltype(kNone) t) : value_(static_cast<uint32_t>(t)) {}
+
+  constexpr operator decltype(kNone)() const {
+    return static_cast<decltype(kNone)>(value_);
+  }
+
+  constexpr explicit operator bool() const {
+    return value_ != kNone;
+  }
+
+  constexpr ExperimentalFlags operator|(const decltype(kNone)& b) const {
+    return static_cast<decltype(kNone)>(value_ | static_cast<uint32_t>(b));
+  }
+  constexpr ExperimentalFlags operator|(const ExperimentalFlags& b) const {
+    return static_cast<decltype(kNone)>(value_ | b.value_);
+  }
+
+  constexpr ExperimentalFlags operator&(const ExperimentalFlags& b) const {
+    return static_cast<decltype(kNone)>(value_ & b.value_);
+  }
+  constexpr ExperimentalFlags operator&(const decltype(kNone)& b) const {
+    return static_cast<decltype(kNone)>(value_ & static_cast<uint32_t>(b));
+  }
+
+  constexpr bool operator==(const ExperimentalFlags& b) const {
+    return value_ == b.value_;
+  }
+
+ private:
+  uint32_t value_;
+};
+
+inline std::ostream& operator<<(std::ostream& stream, const ExperimentalFlags& e) {
+  bool started = false;
+  if (e & ExperimentalFlags::kLambdas) {
+    stream << (started ? "|" : "") << "kLambdas";
+    started = true;
+  }
+  if (e & ExperimentalFlags::kDefaultMethods) {
+    stream << (started ? "|" : "") << "kDefaultMethods";
+    started = true;
+  }
+  if (!started) {
+    stream << "kNone";
+  }
+  return stream;
+}
+
+inline std::ostream& operator<<(std::ostream& stream, const decltype(ExperimentalFlags::kNone)& e) {
+  return stream << ExperimentalFlags(e);
+}
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_EXPERIMENTAL_FLAGS_H_