Add uptime to SingleDebugDaemonLogSource.

BUG=b:67364190

Change-Id: I7cd3816955683342276b585132de5fc37ed936e5
Reviewed-on: https://chromium-review.googlesource.com/718748Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Dariusz Marcinkiewicz <darekm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509706}

chrome/browser/chromeos/system_logs/single_debug_daemon_log_source.cc

@@ -27,6 +27,8 @@ std::string GetLogName(SupportedSource source_type) {
       return "lspci";
     case SupportedSource::kIfconfig:
       return "ifconfig";
+    case SupportedSource::kUptime:
+      return "uptime";
   }
   NOTREACHED();
   return "";

chrome/browser/chromeos/system_logs/single_debug_daemon_log_source.h

@@ -28,6 +28,9 @@ class SingleDebugDaemonLogSource : public SystemLogsSource {
 
     // For "ifconfig" command.
     kIfconfig,
+
+    // For "/proc/uptime" entry.
+    kUptime,
   };
 
   explicit SingleDebugDaemonLogSource(SupportedSource source);