Mojo Log service and a thread-safe client library.

mojo/public/cpp/environment/lib/logging.cc

Index: mojo/public/cpp/environment/lib/logging.cc
diff --git a/mojo/public/cpp/environment/lib/logging.cc b/mojo/public/cpp/environment/lib/logging.cc
index 57f18924820ebe8bbbd156f8df1b796f31fbcf26..91f0ef5095a3d16fa822e7a8cd73325c5c0c62df 100644
--- a/mojo/public/cpp/environment/lib/logging.cc
+++ b/mojo/public/cpp/environment/lib/logging.cc
@@ -32,6 +32,9 @@ const char* GetFilename(const char* s) {
 
 // TODO(vtl): Maybe we should preserve the full path and strip it out at a
 // different level instead?
+// TODO(vardhan): Should we make a timestamp part of the LogMessage?  Since we
+// emit log messages only when we go out of scope, we won't know exactly when
+// log messages are issued.
 LogMessage::LogMessage(MojoLogLevel log_level, const char* file, int line)
     : log_level_(log_level), file_(GetFilename(file)), line_(line) {
 }