Add Static Initializer for leak detector TLS

content/app/content_main_runner.cc

Index: content/app/content_main_runner.cc
diff --git a/content/app/content_main_runner.cc b/content/app/content_main_runner.cc
index 95b852619e5c5bb8c793575a63a7080d8e0315c1..c58bff7ce700dd40027327958f3ee15efe58b57c 100644
--- a/content/app/content_main_runner.cc
+++ b/content/app/content_main_runner.cc
@@ -106,6 +106,10 @@
 
 #endif  // OS_POSIX
 
+#if defined(OS_CHROMEOS)
+#include "components/metrics/leak_detector/leak_detector.h"
+#endif
+
 #if defined(USE_NSS_CERTS)
 #include "crypto/nss_util.h"
 #endif
@@ -756,6 +760,10 @@ class ContentMainRunnerImpl : public ContentMainRunner {
     if (delegate_)
       delegate_->SandboxInitialized(process_type);
 
+#if defined (OS_CHROMEOS)
+    metrics::LeakDetector::StaticInit();

[Primiano Tucci (use gerrit), 2016/06/01 21:26:30]

maybe add a comment explaining that the TLS slot needs to be reserved early to
ensure it gets a low slow number and falls in the glibc fast-path which doesn't
require malloc()s.
Otherwise this will be super mysterious and somebody will be tempted to move it.

[Simon Que, 2016/06/02 17:55:17]

Done.

+#endif
+
     // Return -1 to indicate no early termination.
     return -1;
   }