GTTF: Ensure that when we're testing the logging system will not display dialogs.

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index 851bdcc14c6e0acc3f0510e376e290c0affdc73a..09decbbaca471092ef7201cf7ebec67d887462fa 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -325,6 +325,9 @@ void DisplayDebugMessageInDialog(const std::string& str) {
   if (str.empty())
     return;
 
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kNoErrorDialogs))
+    return;
+
 #if defined(OS_WIN)
   // For Windows programs, it's possible that the message loop is
   // messed up on a fatal error, and creating a MessageBox will cause