diff --git a/content/browser/sandbox_ipc_linux.h b/content/browser/sandbox_ipc_linux.h
new file mode 100644
index 0000000..06c2c604
--- /dev/null
+++ b/content/browser/sandbox_ipc_linux.h
@@ -0,0 +1,90 @@
+// Copyright 2014 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.
+
+// https://chromium.googlesource.com/chromium/src/+/master/docs/linux_sandbox_ipc.md
+
+#ifndef CONTENT_BROWSER_SANDBOX_IPC_LINUX_H_
+#define CONTENT_BROWSER_SANDBOX_IPC_LINUX_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/files/scoped_file.h"
+#include "base/macros.h"
+#include "base/pickle.h"
+#include "base/threading/simple_thread.h"
+#include "content/common/content_export.h"
+#include "third_party/icu/source/common/unicode/uchar.h"
+
+class SkString;
+
+namespace content {
+
+class SandboxIPCHandler : public base::DelegateSimpleThread::Delegate {
+ public:
+  // lifeline_fd: the read end of a pipe which the main thread holds
+  // the other end of.
+  // browser_socket: the browser's end of the sandbox IPC socketpair.
+  SandboxIPCHandler(int lifeline_fd, int browser_socket);
+  ~SandboxIPCHandler() override;
+
+  void Run() override;
+
+  class TestObserver {
+   public:
+    virtual void OnGetFallbackFontForChar(UChar32 c,
+                                          std::string name,
+                                          int id) = 0;
+    virtual void OnFontOpen(int id) = 0;
+  };
+  CONTENT_EXPORT static void SetObserverForTests(TestObserver* observer);
+
+ private:
+  int FindOrAddPath(const SkString& path);
+
+  void HandleRequestFromChild(int fd);
+
+  void HandleFontMatchRequest(int fd,
+                              base::PickleIterator iter,
+                              const std::vector<base::ScopedFD>& fds);
+
+  void HandleFontOpenRequest(int fd,
+                             base::PickleIterator iter,
+                             const std::vector<base::ScopedFD>& fds);
+
+  void HandleGetFallbackFontForChar(int fd,
+                                    base::PickleIterator iter,
+                                    const std::vector<base::ScopedFD>& fds);
+
+  void HandleGetStyleForStrike(int fd,
+                               base::PickleIterator iter,
+                               const std::vector<base::ScopedFD>& fds);
+
+  void HandleLocaltime(int fd,
+                       base::PickleIterator iter,
+                       const std::vector<base::ScopedFD>& fds);
+
+  void HandleMakeSharedMemorySegment(int fd,
+                                     base::PickleIterator iter,
+                                     const std::vector<base::ScopedFD>& fds);
+
+  void HandleMatchWithFallback(int fd,
+                               base::PickleIterator iter,
+                               const std::vector<base::ScopedFD>& fds);
+
+  void SendRendererReply(const std::vector<base::ScopedFD>& fds,
+                         const base::Pickle& reply,
+                         int reply_fd);
+
+  const int lifeline_fd_;
+  const int browser_socket_;
+  std::vector<SkString> paths_;
+
+  DISALLOW_COPY_AND_ASSIGN(SandboxIPCHandler);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_SANDBOX_IPC_LINUX_H_