Move implementation of QuotaManager.getVolumeInfo to base::SysInfo.

base/sys_info.h

 // 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.
 
 #ifndef BASE_SYS_INFO_H_
 #define BASE_SYS_INFO_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 32 matching lines @@
   // Return the number of megabytes of available virtual memory, or zero if it
   // is unlimited.
   static int AmountOfVirtualMemoryMB() {
     return static_cast<int>(AmountOfVirtualMemory() / 1024 / 1024);
   }
 
   // Return the available disk space in bytes on the volume containing |path|,
   // or -1 on failure.
   static int64_t AmountOfFreeDiskSpace(const FilePath& path);
 
+  // Gets the total disk space and available disk space in bytes on the volume
+  // containing |path|, and returns true on success.
+  static bool GetDiskSpaceInfo(const FilePath& path,

[Lei Zhang, 2016/06/10 05:46:37]

Most of the functions here just retrieves one piece of information. Can we just
add GetVolumeSize() instead for consistency? We'll need to retain
QuotaManager::GetVolumeInfo() but it will be simpler. I understand it's slightly
less efficient to call stat() twice, but I don't think this is performance
critical.

[fukino, 2016/06/10 12:10:09]

I added the function which returns only total size, but I named it as
AmountOfTotalDiskSpace to be consistent with AmountOfFreeDiskSpace. WDYT?

+                               int64_t* available_bytes,
+                               int64_t* total_bytes);
+
   // Returns system uptime.
   static TimeDelta Uptime();
 
   // Returns a descriptive string for the current machine model or an empty
   // string if the machine model is unknown or an error occured.
   // e.g. "MacPro1,1" on Mac, or "Nexus 5" on Android. Only implemented on OS X,
   // Android, and Chrome OS. This returns an empty string on other platforms.
   static std::string HardwareModelName();
 
   // Returns the name of the host operating system.
@@ skipping 74 matching lines @@
 
   // Returns true if this is a low-end device.
   // Low-end device refers to devices having less than 512M memory in the
   // current implementation.
   static bool IsLowEndDevice();
 };
 
 }  // namespace base
 
 #endif  // BASE_SYS_INFO_H_