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

base/sys_info_unittest.cc

Index: base/sys_info_unittest.cc
diff --git a/base/sys_info_unittest.cc b/base/sys_info_unittest.cc
index 3f284ba86840b802dc4171aedfd3b089a0b90fcc..1bb7b9688e9953ab0d3c650045644d8a8bd8d0ea 100644
--- a/base/sys_info_unittest.cc
+++ b/base/sys_info_unittest.cc
@@ -44,6 +44,17 @@ TEST_F(SysInfoTest, AmountOfFreeDiskSpace) {
             << tmp_path.value();
 }
 
+TEST_F(SysInfoTest, GetDiskSpaceInfo) {
+  // We aren't actually testing that it's correct, just that it's sane.
+  FilePath tmp_path;
+  ASSERT_TRUE(base::GetTempDir(&tmp_path));
+  int64_t available = 0;
+  int64_t total = 0;
+  EXPECT_TRUE(base::SysInfo::GetDiskSpaceInfo(tmp_path, &available, &total));
+  EXPECT_GT(available, 0) << tmp_path.value();

[Dan Beam, 2016/06/09 17:20:13]

what if the disk is full?  do we want to handle that by changing to _GE?  is
that nuts?

[fukino, 2016/06/10 01:33:36]

I updated it to _GE, and I changed the initial values of |available| and |total|
to -1 to check that the |available| is changed from initial value.

+  EXPECT_GT(total, 0) << tmp_path.value();
+}
+
 #if defined(OS_WIN) || defined(OS_MACOSX)
 TEST_F(SysInfoTest, OperatingSystemVersionNumbers) {
   int32_t os_major_version = -1;