Help make base compile in NaCl.

Turns out intptr_t isn't 64 bits wide in 64-bit NaCl.  This class assumes that
Atomic64 is actually 64 bits wide, so we need to use the int64_t type instead.

Original patch by Eric Seidel.


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67826 0039d316-1c4b-4281-b951-d872f2087c98

base/atomicops.h

@@ -43,8 +43,14 @@ typedef __w64 int32 Atomic32;
 #ifdef ARCH_CPU_64_BITS
 // We need to be able to go between Atomic64 and AtomicWord implicitly.  This
 // means Atomic64 and AtomicWord should be the same type on 64-bit.
+#if defined(OS_NACL)
+// NaCl's intptr_t is not actually 64-bits on 64-bit!
+// http://code.google.com/p/nativeclient/issues/detail?id=1162
+typedef int64_t Atomic64;
+#else
 typedef intptr_t Atomic64;
 #endif
+#endif
 
 // Use AtomicWord for a machine-sized pointer.  It will use the Atomic32 or
 // Atomic64 routines below, depending on your architecture.