Add CurrentProcessInfo::CreationTime() for Linux

chrome/browser/ui/app_list/app_list_service.cc

Index: chrome/browser/ui/app_list/app_list_service.cc
diff --git a/chrome/browser/ui/app_list/app_list_service.cc b/chrome/browser/ui/app_list/app_list_service.cc
index 8120aaeedad289c2d2175477d4d3a4f24bf0d326..5a5f9331883747652241c54aef9f6ea7f6732558 100644
--- a/chrome/browser/ui/app_list/app_list_service.cc
+++ b/chrome/browser/ui/app_list/app_list_service.cc
@@ -47,11 +47,12 @@ void AppListService::RecordShowTimings(const CommandLine& command_line) {
     else
       UMA_HISTOGRAM_LONG_TIMES("Startup.ShowAppListWarmStart", elapsed);
   } else {
-    // base::CurrentProcessInfo::CreationTime() is only defined on win/mac.
-#if defined(OS_WIN) || defined(OS_MACOSX)
+    // base::CurrentProcessInfo::CreationTime() is only defined on some
+    // platforms.
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
     UMA_HISTOGRAM_LONG_TIMES(
         "Startup.ShowAppListColdStart",
-        base::Time::Now() - *base::CurrentProcessInfo::CreationTime());
+        base::Time::Now() - base::CurrentProcessInfo::CreationTime());
 #endif
   }
 }