Add support for running the NaCl plugin in the Linux SUID sandbox

chrome/renderer/renderer_sandbox_support_linux.h

 // 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.
 
 #ifndef CHROME_RENDERER_RENDERER_SANDBOX_SUPPORT_LINUX_H_
 #define CHROME_RENDERER_RENDERER_SANDBOX_SUPPORT_LINUX_H_
 
 #include <stdint.h>
 
 #include <string>
 
 namespace WebKit {
 struct WebFontRenderStyle;
 }
 
 namespace renderer_sandbox_support {
 
 // Return a font family which provides glyphs for the Unicode code points
 // specified by |utf16|
 //   utf16: a native-endian UTF16 string
 //   num_utf16: the number of 16-bit words in |utf16|
 //
 // Returns: the font family or an empty string if the request could not be
 // satisfied.
 std::string getFontFamilyForCharacters(const uint16_t* utf16, size_t num_utf16);
 
 void getRenderStyleForStrike(const char* family, int sizeAndStyle,
                              WebKit::WebFontRenderStyle* out);
 
+// Returns a file descriptor for a shared memory segment.
+int MakeSharedMemorySegmentViaIPC(size_t length);
+
 };  // namespace render_sandbox_support
 
 #endif  // CHROME_RENDERER_RENDERER_SANDBOX_SUPPORT_LINUX_H_