extensions: Add CPU temperatures field to system.cpu.getInfo() function

extensions/common/api/system_cpu.idl

 // Copyright 2013 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.
 
 // Use the <code>system.cpu</code> API to query CPU metadata.
 namespace system.cpu {
 
   // Counters for assessing CPU utilization.  Each field is monotonically
   // increasing while the processor is powered on.  Values are in milliseconds.
   dictionary CpuTime {
@@ skipping 26 matching lines @@
     // The model name of the processors.
     DOMString modelName;
 
     // A set of feature codes indicating some of the processor's capabilities.
     // The currently supported codes are "mmx", "sse", "sse2", "sse3", "ssse3",
     // "sse4_1", "sse4_2", and "avx".
     DOMString[] features;
 
     // Information about each logical processor.
     ProcessorInfo[] processors;
+
+    // List of CPU temperature readings from each thermal zone of the CPU.
+    // Temperatures are in degrees Celsius. Currently supported on Chrome OS

[tbarzic, 2017/04/27 17:50:19]

nit: I'd put "Chrome OS only" part in a separate paragraph, and and maybe make
it bold.

[Simon Que, 2017/04/27 17:59:55]

Done.

+    // only.
+    double[] temperatures;
   };
 
   callback CpuInfoCallback = void (CpuInfo info);
 
   interface Functions {
     // Queries basic CPU information of the system.
     static void getInfo(CpuInfoCallback callback);
   };
 };