Add permissions buts for Pepper plugins.

ppapi/shared_impl/ppapi_permissions.cc

Index: ppapi/shared_impl/ppapi_permissions.cc
diff --git a/ppapi/shared_impl/ppapi_permissions.cc b/ppapi/shared_impl/ppapi_permissions.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2785fd9fa478d799951a70c188befac9e99cc887
--- /dev/null
+++ b/ppapi/shared_impl/ppapi_permissions.cc
@@ -0,0 +1,22 @@
+// Copyright (c) 2012 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 "ppapi/shared_impl/ppapi_permissions.h"
+
+namespace ppapi {
+
+PpapiPermissions::PpapiPermissions() : permissions_(0) {
+}
+
+PpapiPermissions::PpapiPermissions(uint32 perms) : permissions_(perms) {
+}
+
+PpapiPermissions::~PpapiPermissions() {
+}
+
+bool PpapiPermissions::HasPermission(Permission perm) const {
+  return !!(permissions_ & static_cast<uint32>(perm));

[dmichael (off chromium), 2012/07/09 14:41:36]

optional: You could DCHECK that perm has exactly one flag set (so that you can
make sure it's changeable in the future, if we need more than 32). I say this
partly because it would be fun to actually have a practical use for the old:
(x & (x - 1))
trick for detecting if x is a power of two. :-)

+}
+
+}  // namespace ppapi