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

chrome/browser/ui/webui/version_ui.cc

Index: chrome/browser/ui/webui/version_ui.cc
diff --git a/chrome/browser/ui/webui/version_ui.cc b/chrome/browser/ui/webui/version_ui.cc
index 7629f50ba78808b7ce00a4b9e1f420b00302bf90..25cd92dfb5427c5d4955adaeec95ca790fac24a1 100644
--- a/chrome/browser/ui/webui/version_ui.cc
+++ b/chrome/browser/ui/webui/version_ui.cc
@@ -122,6 +122,14 @@ WebUIDataSource* CreateVersionUIDataSource() {
   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);