Include CPU information in UMA system profile.

base/cpu.h

Index: base/cpu.h
diff --git a/base/cpu.h b/base/cpu.h
index 1d45258e06ebcc986d51cd54cba9db7e6d480414..509763e170f4c666089f65db1b5b81097de452a9 100644
--- a/base/cpu.h
+++ b/base/cpu.h
@@ -31,6 +31,7 @@ class BASE_EXPORT CPU {
 
   // Accessors for CPU information.
   const std::string& vendor_name() const { return cpu_vendor_; }
+  int signature() const { return signature_; }
   int stepping() const { return stepping_; }
   int model() const { return model_; }
   int family() const { return family_; }
@@ -55,6 +56,7 @@ class BASE_EXPORT CPU {
   // Query the processor for CPUID information.
   void Initialize();
 
+  int signature_;  // raw form of type, family, model, and stepping
   int type_;  // process type
   int family_;  // family of the processor
   int model_;  // model of processor