Adds AVX detection to CPU and records a histogram of Intel uArch Support

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 06dd8f1617b28f24a59db767416038218717a67b..7de9deb35c6e453dc930f63e5bfe9b9634628eb3 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -14,6 +14,7 @@
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/cpu.h"
 #include "base/debug/trace_event.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ -1001,6 +1002,13 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   StartMetricsRecording();
 #endif
 
+#if defined(ARCH_CPU_X86_FAMILY)

[brettw, 2013/01/31 20:08:43]

If this is the best place you can find, at least put in a separate function at
the top of this file and call it here to keep this big function simpler.

+  base::CPU cpu;
+  base::CPU::IntelMicroArchitecture arch = cpu.getIntelMicroArchitecture();
+  UMA_HISTOGRAM_ENUMERATION("Platform.IntelMaxMicroArchitecture", arch,
+      base::CPU::MaxIntelMicroArchitecture);
+#endif // defined(ARCH_CPU_X86_FAMILY)

[brettw, 2013/01/31 20:08:43]

need two spaces before //

+
   // Create watchdog thread after creating all other threads because it will
   // watch the other threads and they must be running.
   browser_process_->watchdog_thread();