IPC: Make ipc_perftests run on Android.

base/posix/global_descriptors.h

 // 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.
 
 #ifndef BASE_POSIX_GLOBAL_DESCRIPTORS_H_
 #define BASE_POSIX_GLOBAL_DESCRIPTORS_H_
 
 #include "build/build_config.h"
 
 #include <vector>
@@ skipping 23 matching lines @@
 // need to define keys, then values should be chosen randomly so as not to
 // collide.
 class BASE_EXPORT GlobalDescriptors {
  public:
   typedef uint32_t Key;
   typedef std::pair<Key, int> KeyFDPair;
   typedef std::vector<KeyFDPair> Mapping;
 
   // Often we want a canonical descriptor for a given Key. In this case, we add
   // the following constant to the key value:
+#if !defined(OS_ANDROID)
   static const int kBaseDescriptor = 3;  // 0, 1, 2 are already taken.
+#else
+  static const int kBaseDescriptor = 4;  // 3 used by __android_log_write().
+#endif
 
   // Return the singleton instance of GlobalDescriptors.
   static GlobalDescriptors* GetInstance();
 
   // Get a descriptor given a key. It is a fatal error if the key is not known.
   int Get(Key key) const;
 
   // Get a descriptor give a key. Returns -1 on error.
   int MaybeGet(Key key) const;
 
   // Set the descriptor for the given key.
   void Set(Key key, int fd);
 
   void Reset(const Mapping& mapping);
 
  private:
   friend struct DefaultSingletonTraits<GlobalDescriptors>;
   GlobalDescriptors();
   ~GlobalDescriptors();
 
   Mapping descriptors_;
 };
 
 }  // namespace base
 
 #endif  // BASE_POSIX_GLOBAL_DESCRIPTORS_H_