Implement ContentSecurityPolicy on the browser-side.

content/common/content_security_policy/csp_context.h

Index: content/common/content_security_policy/csp_context.h
diff --git a/content/common/content_security_policy/csp_context.h b/content/common/content_security_policy/csp_context.h
new file mode 100644
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+++ b/content/common/content_security_policy/csp_context.h
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+// Copyright 2017 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 CONTENT_COMMON_CONTENT_SECURITY_POLICY_CSP_CONTEXT_H_
+#define CONTENT_COMMON_CONTENT_SECURITY_POLICY_CSP_CONTEXT_H_
+
+#include <vector>
+
+#include "content/common/content_export.h"
+#include "content/common/content_security_policy/content_security_policy.h"
+#include "content/common/content_security_policy_header.h"
+#include "url/gurl.h"
+#include "url/origin.h"
+
+namespace content {
+
+// A CSPContext represents the system on which the Content-Security-Policy are
+// enforced. One must define via its virtual methods how to report violations,
+// how to log messages on the console and what is the set of scheme that bypass
+// the CSP.
+// Its main implementation is in content/browser/frame_host/csp_context_impl.h
+class CONTENT_EXPORT CSPContext {
+ public:
+  CSPContext();
+  virtual ~CSPContext();
+
+  bool Allow(const std::vector<ContentSecurityPolicy>& policies,
+             CSPDirective::Name directive_name,
+             const GURL& url,
+             bool is_redirect = false);
+
+  void SetSelf(const url::Origin origin);
+  bool AllowSelf(const GURL& url);
+  bool ProtocolMatchesSelf(const GURL& url);
+
+  virtual void LogToConsole(const std::string& message);
+  virtual void ReportViolation(
+      const std::string& directive_text,
+      const std::string& effective_directive,
+      const std::string& message,
+      const GURL& blocked_url,
+      const std::vector<std::string>& report_end_points,
+      const std::string& header,
+      blink::WebContentSecurityPolicyType disposition);
+
+  bool SelfSchemeShouldBypassCSP();
+
+ private:
+  virtual bool SchemeShouldBypassCSP(const base::StringPiece& scheme);
+
+  bool has_self_ = false;
+  std::string self_scheme_;
+  CSPSource self_source_;
+
+  DISALLOW_COPY_AND_ASSIGN(CSPContext);
+};
+
+}  // namespace content
+#endif  // CONTENT_COMMON_CONTENT_SECURITY_POLICY_CSP_CONTEXT_H_