Linux: plumb fontconfig call out to the sandbox host.

chrome/renderer/renderer_sandbox_support_linux.cc

+// Copyright (c) 2009 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 "chrome/renderer/renderer_sandbox_support_linux.h"
+
+#include "base/pickle.h"
+#include "base/unix_domain_socket_posix.h"
+#include "chrome/common/sandbox_methods_linux.h"
+
+namespace renderer_sandbox_support {
+
+std::string getFontFamilyForCharacters(const uint16_t* utf16, size_t num_utf16) {
+  Pickle request;
+  request.WriteInt(LinuxSandbox::METHOD_GET_FONT_FAMILY_FOR_CHARS);
+  request.WriteInt(num_utf16);
+  for (size_t i = 0; i < num_utf16; ++i)
+    request.WriteUInt32(utf16[i]);
+
+  uint8_t buf[512];
+  static const int kMagicSandboxFD = 4;
+  const ssize_t n = base::SendRecvMsg(kMagicSandboxFD, buf, sizeof(buf), NULL,
+                                      request);
+
+  std::string family_name;
+  if (n != -1) {
+    Pickle reply(reinterpret_cast<char*>(buf), n);
+    void* pickle_iter = NULL;
+    reply.ReadString(&pickle_iter, &family_name);
+  }
+
+  return family_name;
+}
+
+}  // namespace render_sandbox_support