Chrome OS multi-profiles backend and UI.

chrome/common/logging_chrome.cc

Index: chrome/common/logging_chrome.cc
diff --git a/chrome/common/logging_chrome.cc b/chrome/common/logging_chrome.cc
index 909587355302e388755ff5719ee075a9c3f75192..c9bdc28e37f3a7f9f3dd2f4ba360e8c19946ecd1 100644
--- a/chrome/common/logging_chrome.cc
+++ b/chrome/common/logging_chrome.cc
@@ -216,6 +216,13 @@ base::FilePath GetSessionLogFile(const CommandLine& command_line) {
 }
 
 void RedirectChromeLogging(const CommandLine& command_line) {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kMultiProfiles) &&
+      chrome_logging_redirected_) {
+    // TODO(nkostylev): Support multiple active users.
+    LOG(ERROR) << "NOT redirecting logging for multi-profiles case.";
+    return;
+  }
+
   DCHECK(!chrome_logging_redirected_) <<
     "Attempted to redirect logging when it was already initialized.";