Refine systemInfo.cpu API defintions and provide systemInfo.cpu.get impl for Windows and Linux

chrome/common/extensions/api/experimental_system_info_cpu.idl

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // File-level comment to appease parser. Eventually this will not be necessary.
 namespace experimental.systemInfo.cpu {
 
-  dictionary CpuCoreInfo {
-    // Indicates the load of CPU core, as a number between 0 and 100.
-    long load;
-  };
-  
   dictionary CpuInfo {
-    // The array of the CPU processors in the system.
-    CpuCoreInfo[] cores;
+    // The number of logical processors.
+    long numOfProcessors;
+    // The architecture name of the processors.
+    DOMString archName;
+    // The model name of the processors.
+    DOMString modelName;
   };
 
-  callback CpuInfoCallback = void (CpuInfo prop);
-  callback CpuUpdateCallback = void (ChangeInfo info);
+  dictionary CpuUpdateInfo {
+    // The average load of all processors, in percent number.
+    long avgLoad;

[Mihai Parparita -not on Chrome, 2012/09/04 20:23:47]

Don't abbreviate "average".

Also, "load" seems like a confusing term, since it could mean the Linux load
average, which is not what is returned here. "usage" perhaps?

Also, CPU usage is generally represented with a double (see
http://code.google.com/searchframe#OAMlx_jo-ck/src/base/process_util.h&type=c...)

[Hongbo Min, 2012/09/05 05:31:03]

Done.

+    // The load array for each logic processors, in percent number.
+    long[] loadsPerProcessor;
+  };
+
+  callback CpuInfoCallback = void (CpuInfo info);
   
   interface Functions {
-    // Get CPU property.
+    // Get CPU information.
     static void get(CpuInfoCallback callback);
   };
 };