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

extensions/browser/api/system_cpu/system_cpu_apitest.cc

 // 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.
 
 #include "extensions/browser/api/system_cpu/cpu_info_provider.h"
 #include "extensions/shell/test/shell_apitest.h"
 
 namespace extensions {
 
 using api::system_cpu::CpuInfo;
@@ skipping 10 matching lines @@
     info_.features.clear();
     info_.features.push_back("mmx");
     info_.features.push_back("avx");
 
     info_.processors.clear();
     info_.processors.push_back(api::system_cpu::ProcessorInfo());
     info_.processors[0].usage.kernel = 1;
     info_.processors[0].usage.user = 2;
     info_.processors[0].usage.idle = 3;
     info_.processors[0].usage.total = 6;
+
+    // The fractional part of these values should be exactly represented as
+    // floating points to avoid rounding errors.
+    info_.temperatures = {30.125, 40.0625};
     return true;
   }
 
  private:
   ~MockCpuInfoProviderImpl() override {}
 };
 
 class SystemCpuApiTest : public ShellApiTest {
  public:
   SystemCpuApiTest() {}
   ~SystemCpuApiTest() override {}
 
   void SetUpInProcessBrowserTestFixture() override {
     ShellApiTest::SetUpInProcessBrowserTestFixture();
   }
 };
 
 IN_PROC_BROWSER_TEST_F(SystemCpuApiTest, Cpu) {
   CpuInfoProvider* provider = new MockCpuInfoProviderImpl();
   // The provider is owned by the single CpuInfoProvider instance.
   CpuInfoProvider::InitializeForTesting(provider);
   ASSERT_TRUE(RunAppTest("system/cpu")) << message_;
 }
 
 }  // namespace extensions