win: Let about:version list the C++ compiler used to build chrome.

chrome/browser/ui/webui/version_ui.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/ui/webui/version_ui.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/version_handler.h"
@@ skipping 104 matching lines @@
                                   IDS_ABOUT_VERSION_EXECUTABLE_PATH);
   html_source->AddString("executable_path", std::string());
 
   html_source->AddLocalizedString("profile_path_name",
                                   IDS_ABOUT_VERSION_PROFILE_PATH);
   html_source->AddString("profile_path", std::string());
 
   html_source->AddLocalizedString("variations_name",
                                   IDS_ABOUT_VERSION_VARIATIONS);
 
+#if defined(OS_WIN)
+#if defined(__clang__)
+  html_source->AddString("compiler", "clang");
+#else
+  html_source->AddString("compiler", "MSVC");
+#endif
+#endif
+
   html_source->SetJsonPath("strings.js");
   html_source->AddResourcePath("version.js", IDR_ABOUT_VERSION_JS);
   html_source->AddResourcePath("about_version.css", IDR_ABOUT_VERSION_CSS);
   html_source->SetDefaultResource(IDR_ABOUT_VERSION_HTML);
   return html_source;
 }
 
 }  // namespace
 
 VersionUI::VersionUI(content::WebUI* web_ui)
@@ skipping 10 matching lines @@
   // Set up the chrome://theme/ source.
   ThemeSource* theme = new ThemeSource(profile);
   content::URLDataSource::Add(profile, theme);
 #endif
 
   WebUIDataSource::Add(profile, CreateVersionUIDataSource());
 }
 
 VersionUI::~VersionUI() {
 }