Remove anonymous namespaces.

No one likes them and we're pretty inconsistent at using them. We're
much better with 'static'.

Change-Id: I65eeffd0fb60633edca30923af0caedb06a0105d
diff --git a/src/utils.h b/src/utils.h
index e774a3b..cdd8fad 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -240,18 +240,21 @@
 // Returns the current date in ISO yyyy-mm-dd hh:mm:ss format.
 std::string GetIsoDate();
 
-// Returns the current time in milliseconds (using the POSIX CLOCK_MONOTONIC).
+// Returns the monotonic time since some unspecified starting point in milliseconds.
 uint64_t MilliTime();
 
-// Returns the current time in microseconds (using the POSIX CLOCK_MONOTONIC).
+// Returns the monotonic time since some unspecified starting point in microseconds.
 uint64_t MicroTime();
 
-// Returns the current time in nanoseconds (using the POSIX CLOCK_MONOTONIC).
+// Returns the monotonic time since some unspecified starting point in nanoseconds.
 uint64_t NanoTime();
 
-// Returns the current time in microseconds (using the POSIX CLOCK_THREAD_CPUTIME_ID).
+// Returns the thread-specific CPU-time clock in microseconds or -1 if unavailable.
 uint64_t ThreadCpuMicroTime();
 
+// Returns the thread-specific CPU-time clock in nanoseconds or -1 if unavailable.
+uint64_t ThreadCpuNanoTime();
+
 // Converts the given number of nanoseconds to milliseconds.
 static inline uint64_t NsToMs(uint64_t ns) {
   return ns / 1000 / 1000;