Fix flame graphs for Chromium's perl

The version of perl that ships with Chromium's depot_tools can't handle
CRLF endings on text files, so I've modified xperf_to_collapsedstacks.py
to write the collapsed stacks in binary mode.

Also, there was a missing parameter to a format-string function.

UIforETW/UIforETWDlg.cpp

@@ -1891,7 +1891,7 @@ void CUIforETWDlg::CreateFlameGraph(const std::wstring& traceFilename)
 {
 	outputPrintf(L"\nCreating CPU Usage (Sampled) flame graph of busiest process in %s "
 				 L"(requires python, perl and flamegraph.pl). UIforETW will hang while "
-				 L"this is calculated...\n");
+				 L"this is calculated...\n", traceFilename.c_str());
 	std::wstring pythonPath = FindPython();
 	if (!pythonPath.empty())
 	{

bin/xperf_to_collapsedstacks.py

@@ -1,4 +1,4 @@
-# Copyright 2015 Google Inc. All Rights Reserved.
+# Copyright 2015 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -156,7 +156,10 @@
 	for stack in threadSamples:
 		sortedStacks.append("%s %d\n" % (stack, threadSamples[stack]))
 	sortedStacks.sort()
-	out = open(outputName, "wt")
+	# Some versions of perl (the version that ships with Chromium's depot_tools
+	# for one) can't handle reading files with CRLF line endings, so write the
+	# file as binary to avoid line-ending translation.
+	out = open(outputName, "wb")
 	for stack in sortedStacks:
 		out.write(stack)
 	# Force the file closed so that the results will be available when we the