Implement profiler log writing at shutdown

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 1f3294552c7ca8901a246fff6aeae7a07e21d776..1cb19859bb68b500b5c62d2e2f4f64143d1cb70e 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -945,6 +945,9 @@ const char kProfilingAtStart[]              = "profiling-at-start";
 // The default is chrome-profile-{pid}.
 const char kProfilingFile[]                 = "profiling-file";
 
+// Specifies a path to output profiling information at shutdown.
+const char kProfilingOutputFile[]            = "profiling-output-file";
+
 // Controls whether profile data is periodically flushed to a file. Normally
 // the data gets written on exit but cases exist where chrome doesn't exit
 // cleanly (especially when using single-process). A time in seconds can be