Add the implementation skeleton for systeminfo.cpu API

chrome/browser/extensions/api/system_info_cpu/system_info_cpu_api.cc

+// 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.
+#include "chrome/browser/extensions/api/system_info_cpu/system_info_cpu_api.h"
+
+#include "base/logging.h"
+#include "content/public/browser/browser_thread.h"
+#include "chrome/browser/extensions/api/system_info_cpu/cpu_info_provider.h"
+
+namespace extensions {
+using api::experimental_system_info_cpu::CpuInfo;
+using api::experimental_system_info_cpu::CpuCoreInfo;
+using content::BrowserThread;
+
+SystemInfoCpuGetFunction::SystemInfoCpuGetFunction() {
+}
+
+SystemInfoCpuGetFunction::~SystemInfoCpuGetFunction() {
+  // Delete the provider that was created on FILE thread.
+  BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE, provider_);
+}
+
+bool SystemInfoCpuGetFunction::RunImpl() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
+    base::Bind(&SystemInfoCpuGetFunction::WorkOnFileThread, this));
+  return true;
+}
+
+void SystemInfoCpuGetFunction::WorkOnFileThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  provider_ = CpuInfoProvider::Create();
+  GetCpuInfoOnFileThread();
+}
+
+void SystemInfoCpuGetFunction::GetCpuInfoOnFileThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  bool success = false;
+
+  CpuInfo info;
+  if (provider_ && provider_->GetCpuInfo(&info)) {
+    SetResult(info.ToValue().release());
+    success = true;
+  } else {
+    SetError("Error in querying cpu information!");
+  }
+  // Respond on UI thread.
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&SystemInfoCpuGetFunction::RespondOnUIThread, this, success));
+}
+
+
+void SystemInfoCpuGetFunction::RespondOnUIThread(bool success) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  SendResponse(success);
+}
+
+// A mock implementation of CpuInfoProver for temporary usage.
+// Will be moved out when the platform specific implementation are done.
+class MockCpuInfoProvider : public CpuInfoProvider {
+ public:
+  MockCpuInfoProvider() {}
+  virtual ~MockCpuInfoProvider() {}
+  virtual bool GetCpuInfo(CpuInfo* info) OVERRIDE;
+};
+
+bool MockCpuInfoProvider::GetCpuInfo(CpuInfo* info) {
+  if (!info) return false;
+  linked_ptr<CpuCoreInfo> core(new CpuCoreInfo());
+  core->load = 53;
+  info->cores.push_back(core);
+  return true;
+}
+
+// static
+CpuInfoProvider* CpuInfoProvider::Create() {
+  return new MockCpuInfoProvider();
+}
+
+}  // namespace extensions