Ignore malformed arguments to --original-process-start-time.

chrome/browser/chrome_browser_main.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chrome_browser_main.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 412 matching lines @@
     const CommandLine& command_line,
     const base::FilePath& current_directory) {
   // Drop the request if the browser process is already in shutdown path.
   if (!g_browser_process || g_browser_process->IsShuttingDown())
     return false;
 
   if (command_line.HasSwitch(switches::kOriginalProcessStartTime)) {
     std::string start_time_string =
         command_line.GetSwitchValueASCII(switches::kOriginalProcessStartTime);
     int64 remote_start_time;
-    base::StringToInt64(start_time_string, &remote_start_time);
-    UMA_HISTOGRAM_LONG_TIMES(
-        "Startup.WarmStartTimeFromRemoteProcessStart",
-        base::Time::Now() - base::Time::FromInternalValue(remote_start_time));
+    if (base::StringToInt64(start_time_string, &remote_start_time)) {
+      UMA_HISTOGRAM_LONG_TIMES(
+          "Startup.WarmStartTimeFromRemoteProcessStart",
+          base::Time::Now() - base::Time::FromInternalValue(remote_start_time));
+    }
   }
 
   g_browser_process->platform_part()->PlatformSpecificCommandLineProcessing(
       command_line);
 
   // TODO(erikwright): Consider removing this - AFAIK it is no longer used.
   // Handle the --uninstall-extension startup action. This needs to done here in
   // the process that is running with the target profile, otherwise the
   // uninstall will fail to unload and remove all components.
   if (command_line.HasSwitch(switches::kUninstallExtension)) {
@@ skipping 1361 matching lines @@
     if (base::win::GetVersion() <= base::win::VERSION_XP)
       uma_name += "_XP";
 
     uma_name += "_PreRead_";
     uma_name += pre_read_percentage;
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }