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 245f860522411718aac24e6fc5e35542f0145838..80835639b48e0d48e8f4879071d89d1d9a2038d1 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"
@@ -207,6 +208,13 @@ using content::BrowserThread;
 
 namespace {
 
+void LogIntelMicroArchitecture() {
+  base::CPU cpu;
+  base::CPU::IntelMicroArchitecture arch = cpu.GetIntelMicroArchitecture();
+  UMA_HISTOGRAM_ENUMERATION("Platform.IntelMaxMicroArchitecture", arch,
+      base::CPU::MAX_INTEL_MICRO_ARCHITECTURE);
+}
+
 // This function provides some ways to test crash and assertion handling
 // behavior of the program.
 void HandleTestParameters(const CommandLine& command_line) {
@@ -1029,6 +1037,10 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   StartMetricsRecording();
 #endif
 
+#if defined(ARCH_CPU_X86_FAMILY)
+  LogIntelMicroArchitecture();
+#endif  // defined(ARCH_CPU_X86_FAMILY)
+
   // Create watchdog thread after creating all other threads because it will
   // watch the other threads and they must be running.
   browser_process_->watchdog_thread();