Pepper: Move GetSandboxISA() to PPB_NaCl_Private.

components/nacl/renderer/sandbox_arch.cc

Index: components/nacl/renderer/sandbox_arch.cc
diff --git a/components/nacl/renderer/sandbox_arch.cc b/components/nacl/renderer/sandbox_arch.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3a297495bcd751f6120249354f4abfb61abe8dcf
--- /dev/null
+++ b/components/nacl/renderer/sandbox_arch.cc
@@ -0,0 +1,38 @@
+// Copyright (c) 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.
+
+#include "base/logging.h"
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
+namespace nacl {
+
+const char* GetSandboxArch() {
+#if defined(ARCH_CPU_ARM_FAMILY)
+  return "arm";
+#elif defined(ARCH_CPU_MIPS_FAMILY)
+  return "mips32";
+#elif defined(ARCH_CPU_X86_FAMILY)
+
+#if defined(OS_WIN)
+  // We have to check the host architecture on Windows.
+  // See sandbox_isa.h for an explanation why.
+  if (base::win::OSInfo::GetInstance()->architecture() ==
+      base::win::OSInfo::X64_ARCHITECTURE)
+    return "x86-64";
+  else
+    return "x86-32";
+#elif ARCH_CPU_64_BITS
+  return "x86-64";
+#else
+  return "x86-32";
+#endif  // defined(OS_WIN)
+
+#else
+#error Architecture not supported.
+#endif
+}
+
+}  // namespace nacl