Move trial token code to content/common.

content/common/origin_trials/trial_token_validator.cc

Index: content/common/origin_trials/trial_token_validator.cc
diff --git a/content/common/origin_trials/trial_token_validator.cc b/content/common/origin_trials/trial_token_validator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b7d61fec4b1969e21fc6de8cce55143c1a3fc14f
--- /dev/null
+++ b/content/common/origin_trials/trial_token_validator.cc
@@ -0,0 +1,28 @@
+// Copyright 2016 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.
+
+#include "content/common/origin_trials/trial_token_validator.h"
+
+#include "base/time/time.h"
+#include "content/common/origin_trials/trial_token.h"
+#include "content/public/common/content_client.h"
+
+namespace content {
+
+bool TrialTokenValidator::ValidateToken(const std::string& token,
+                                        const url::Origin& origin,
+                                        base::StringPiece featureName) {
+  scoped_ptr<TrialToken> trial_token = TrialToken::Parse(token);
+
+  // TODO(iclelland): Allow for multiple signing keys, and iterate over all
+  // active keys here. https://crbug.com/543220
+  ContentClient* content_client = GetContentClient();
+  base::StringPiece public_key = content_client->GetOriginTrialPublicKey();
+
+  return !public_key.empty() && trial_token &&
+         trial_token->IsAppropriate(origin, featureName) &&
+         trial_token->IsValid(base::Time::Now(), public_key);
+}
+
+}  // namespace content