Fix/suppress unittests broken on Android

test/unittests/base/platform/platform-unittest.cc

 // Copyright 2014 the V8 project 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 "src/base/platform/platform.h"
 
 #if V8_OS_POSIX
 #include <unistd.h>  // NOLINT
 #endif
 
@@ skipping 76 matching lines @@
       CHECK_EQ(GetValue(arraysize(keys_) - i - 1),
                Thread::GetExistingThreadLocal(keys_[i]));
     }
   }
 
  private:
   static void* GetValue(size_t x) {
     return reinterpret_cast<void*>(static_cast<uintptr_t>(x + 1));
   }
 
+#if defined(ANDROID)
+  // Older versions of Android have fewer TLS slots (nominally 64, but the
+  // system uses "about 5 of them" itself).
+  Thread::LocalStorageKey keys_[32];
+#else
   Thread::LocalStorageKey keys_[256];
+#endif
 };
 
 }  // namespace
 
 
 TEST_F(ThreadLocalStorageTest, DoTest) {
   Run();
   Start();
   Join();
 }
 
 }  // namespace base
 }  // namespace v8