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

extensions/common/api/system_cpu.idl

Index: extensions/common/api/system_cpu.idl
diff --git a/extensions/common/api/system_cpu.idl b/extensions/common/api/system_cpu.idl
index bb3ac857f0db1a30dbfed6f0f328674e7d99fa51..7b56cee104de585e4998fa9bd51c56b474fad1d0 100644
--- a/extensions/common/api/system_cpu.idl
+++ b/extensions/common/api/system_cpu.idl
@@ -44,6 +44,11 @@ namespace system.cpu {
 
     // 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);