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

base/cpu.h

Index: base/cpu.h
diff --git a/base/cpu.h b/base/cpu.h
index 957b1a564c9a6b23a03f9a56d1972d586240e4df..65fda47950c9dae97dcd9a288d3d65c2affac79b 100644
--- a/base/cpu.h
+++ b/base/cpu.h
@@ -17,6 +17,18 @@ class BASE_EXPORT CPU {
   // Constructor
   CPU();
 
+  enum IntelMicroArchitecture {
+    PENTIUM,
+    SSE,
+    SSE2,
+    SSE3,
+    SSSE3,
+    SSE41,
+    SSE42,
+    AVX,
+    MAX_INTEL_MICRO_ARCHITECTURE
+  };
+
   // Accessors for CPU information.
   const std::string& vendor_name() const { return cpu_vendor_; }
   int stepping() const { return stepping_; }
@@ -32,6 +44,8 @@ class BASE_EXPORT CPU {
   bool has_ssse3() const { return has_ssse3_; }
   bool has_sse41() const { return has_sse41_; }
   bool has_sse42() const { return has_sse42_; }
+  bool has_avx() const { return has_avx_; }
+  IntelMicroArchitecture GetIntelMicroArchitecture() const;
   const std::string& cpu_brand() const { return cpu_brand_; }
 
  private:
@@ -51,6 +65,7 @@ class BASE_EXPORT CPU {
   bool has_ssse3_;
   bool has_sse41_;
   bool has_sse42_;
+  bool has_avx_;
   std::string cpu_vendor_;
   std::string cpu_brand_;
 };