Revert of Remove MockConstraints

components/test_runner/mock_constraints.h

Index: components/test_runner/mock_constraints.h
diff --git a/components/test_runner/mock_constraints.h b/components/test_runner/mock_constraints.h
new file mode 100644
index 0000000000000000000000000000000000000000..0096b4ba31e53c394ed925f9ddeb4293551aff01
--- /dev/null
+++ b/components/test_runner/mock_constraints.h
@@ -0,0 +1,23 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_TEST_RUNNER_MOCK_CONSTRAINTS_H_
+#define COMPONENTS_TEST_RUNNER_MOCK_CONSTRAINTS_H_
+
+namespace blink {
+class WebMediaConstraints;
+class WebString;
+}
+
+namespace test_runner {
+
+class MockConstraints {
+ public:
+  static bool VerifyConstraints(const blink::WebMediaConstraints& constraints,
+                                blink::WebString* failed_constraint = 0);
+};
+
+}  // namespace test_runner
+
+#endif  // COMPONENTS_TEST_RUNNER_MOCK_CONSTRAINTS_H_