We can't use pthread_condattr_setclock() in NaCl.

src/platform/condition-variable.cc

Index: src/platform/condition-variable.cc
diff --git a/src/platform/condition-variable.cc b/src/platform/condition-variable.cc
index 84df9760d116421dc65a4fc6f7c0b3c7afefa897..e2bf3882ece80b7305658c193c45037cbb7af6ad 100644
--- a/src/platform/condition-variable.cc
+++ b/src/platform/condition-variable.cc
@@ -41,8 +41,8 @@ ConditionVariable::ConditionVariable() {
   // TODO(bmeurer): The test for V8_LIBRT_NOT_AVAILABLE is a temporary
   // hack to support cross-compiling Chrome for Android in AOSP. Remove
   // this once AOSP is fixed.
-#if (V8_OS_FREEBSD || V8_OS_NETBSD || V8_OS_OPENBSD || V8_LIBC_GLIBC) && \
-    !V8_LIBRT_NOT_AVAILABLE
+#if (V8_OS_FREEBSD || V8_OS_NETBSD || V8_OS_OPENBSD || \
+     (V8_OS_LINUX && V8_LIBC_GLIBC)) && !V8_LIBRT_NOT_AVAILABLE
   // On Free/Net/OpenBSD and Linux with glibc we can change the time
   // source for pthread_cond_timedwait() to use the monotonic clock.
   pthread_condattr_t attr;
@@ -107,8 +107,8 @@ bool ConditionVariable::WaitFor(Mutex* mutex, const TimeDelta& rel_time) {
   // TODO(bmeurer): The test for V8_LIBRT_NOT_AVAILABLE is a temporary
   // hack to support cross-compiling Chrome for Android in AOSP. Remove
   // this once AOSP is fixed.
-#if (V8_OS_FREEBSD || V8_OS_NETBSD || V8_OS_OPENBSD || V8_LIBC_GLIBC) && \
-    !V8_LIBRT_NOT_AVAILABLE
+#if (V8_OS_FREEBSD || V8_OS_NETBSD || V8_OS_OPENBSD || \
+     (V8_OS_LINUX && V8_LIBC_GLIBC)) && !V8_LIBRT_NOT_AVAILABLE
   // On Free/Net/OpenBSD and Linux with glibc we can change the time
   // source for pthread_cond_timedwait() to use the monotonic clock.
   result = clock_gettime(CLOCK_MONOTONIC, &ts);