Add systeminfo.storage API implementation skeleton

chrome/browser/extensions/api/systeminfo_storage/systeminfo_storage_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/systeminfo_storage/systeminfo_storage_api.h"
+
+#include "base/logging.h"
+#include "base/json/json_writer.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string_number_conversions.h"
+#include "base/string_piece.h"
+#include "base/values.h"
+#include "content/public/browser/browser_thread.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/api/systeminfo_storage/storage_info_provider.h"
+
+namespace extensions {
+using api::experimental_systeminfo_storage::StorageInfo;
+using api::experimental_systeminfo_storage::StorageUnitInfo;
+using content::BrowserThread;
+
+SysteminfoStorageGetFunction::SysteminfoStorageGetFunction() {
+}
+
+SysteminfoStorageGetFunction::~SysteminfoStorageGetFunction() {
+}
+
+bool SysteminfoStorageGetFunction::RunImpl() {
+  BrowserThread::PostTask(
+      BrowserThread::FILE, FROM_HERE,
+      base::Bind(&SysteminfoStorageGetFunction::WorkOnFileThread, this));
+  return true;
+}
+
+void SysteminfoStorageGetFunction::WorkOnFileThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  bool success = false;
+  scoped_ptr<StorageInfoProvider> provider(StorageInfoProvider::Create());
+  StorageInfo info;
+  if (provider.get() && provider->GetStorageInfo(&info)) {
+    SetResult(info.ToValue().release());
+    success = true;
+  } else {
+    SetError("Error in querying storage information");
+  }
+
+  // Response the result on UI thread.
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&SysteminfoStorageGetFunction::RespondOnUIThread,
+      this, success));
+}
+
+void SysteminfoStorageGetFunction::RespondOnUIThread(bool success) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  SendResponse(success);
+}
+
+#if !defined(OS_WIN)
+// A Mock implementation for temporary usage. Will be moved out for testing
+// once the platform specifc implementations are ready.
+const char kStorageTypeUnknownStr[] = "unknown";

[Mihai Parparita -not on Chrome, 2012/08/10 20:46:47]

BTW, filed http://crbug.com/141940, which, if fixed, would allow you to reuse
the enum values from your .idl file.

+const char kStorageTypeHardDiskStr[] = "harddisk";
+const char kStorageTypeUSBStr[] = "usb";
+const char kStorageTypeMMCStr[] = "mmc";
+
+class MockStorageInfoProvider : public StorageInfoProvider {
+ public:
+  MockStorageInfoProvider() {}
+  virtual ~MockStorageInfoProvider() {}
+  virtual bool GetStorageInfo(StorageInfo* info) OVERRIDE;
+};
+
+bool MockStorageInfoProvider::GetStorageInfo(StorageInfo* info) {
+  if (info == NULL) return false;
+  linked_ptr<StorageUnitInfo> unit(new StorageUnitInfo());
+  unit->id = "0xbeaf";
+  unit->type = kStorageTypeUnknownStr;
+  unit->capacity = 4098;
+  unit->available_capacity = 1000;
+
+  info->units.push_back(unit);
+  return true;
+}
+
+// static
+StorageInfoProvider* StorageInfoProvider::Create() {
+  return new MockStorageInfoProvider();
+}
+#endif  // !OS_WIN
+
+}  // namespace extensions