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

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index 86aee41875f0bcfe786c2eef36d392a214c1122b..0a853cdf4524a7132cff225234e9bbbd3348a699 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -8,6 +8,7 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
+#include "base/cpu.h"
 #include "base/debug/trace_event.h"
 #include "base/memory/ref_counted.h"
 #include "base/metrics/histogram.h"
@@ -270,6 +271,28 @@ GpuProcessHost* GpuProcessHost::Get(GpuProcessKind kind,
   int host_id;
   host_id = ++last_host_id;
 
+#if defined(ARCH_CPU_X86_FAMILY)
+  base::CPU cpu;
+  int arch = 0;
+  if (cpu.has_sse())
+    arch = 1;

[apatrick_chromium, 2013/01/25 19:06:30]

nit: use an enum and comment that it must not be renumbered and that it has to
be kept in sync with histograms.xml.

+  if (cpu.has_sse2())
+    arch = 2;
+  if (cpu.has_sse3())
+    arch = 3;
+  if (cpu.has_ssse3())
+    arch = 4;
+  if (cpu.has_sse41())
+    arch = 5;
+  if (cpu.has_sse42())
+    arch = 6;
+  if (cpu.has_avx())
+    arch = 7;
+  UMA_HISTOGRAM_ENUMERATION("Platform.IntelMaxuArchSupport",
+                            arch,
+                            8);
+#endif // defined(ARCH_CPU_X86_FAMILY)
+
   UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLaunchCause",
                             cause,
                             CAUSE_FOR_GPU_LAUNCH_MAX_ENUM);