Add a PGO tag for the PGO builds in chrome://version

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 2961ea8e2bf0455e4af98ab128064e753ac46fc5..fb1344bbe28523938e9219209887a14af8bea006 100644
--- a/chrome/browser/ui/webui/version_ui.cc
+++ b/chrome/browser/ui/webui/version_ui.cc
@@ -138,7 +138,11 @@ WebUIDataSource* CreateVersionUIDataSource() {
 #if defined(__clang__)
   html_source->AddString("compiler", "clang");
 #elif defined(_MSC_VER) && _MSC_VER == 1900
+#if BUILDFLAG(PGO_BUILD)
+  html_source->AddString("compiler", "MSVC 2015 (PGO)");
+#else
   html_source->AddString("compiler", "MSVC 2015");
+#endif
 #elif defined(_MSC_VER) && _MSC_VER == 1800

[brucedawson, 2016/07/15 19:43:07]

Could delete this at the same time? I don't know whether that's a good idea or
not.

[Sébastien Marchand, 2016/07/18 19:10:41]

Yeah, make sense as we don't support VS2013 anymore.

   html_source->AddString("compiler", "MSVC 2013");
 #elif defined(_MSC_VER)