IPC: Make ipc_perftests run on Android.

base/posix/global_descriptors.h

Index: base/posix/global_descriptors.h
diff --git a/base/posix/global_descriptors.h b/base/posix/global_descriptors.h
index c7b9f87fa4b37a9a79a5fb99d90de6f68c738dbc..3d7369c3174a9e8f0df4b0cdd85c4428111a94db 100644
--- a/base/posix/global_descriptors.h
+++ b/base/posix/global_descriptors.h
@@ -41,7 +41,11 @@ class BASE_EXPORT GlobalDescriptors {
 
   // 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();