Try to speed up SimpleCache index re-sync on Windows.

net/disk_cache/simple/simple_index_file.cc

Index: net/disk_cache/simple/simple_index_file.cc
diff --git a/net/disk_cache/simple/simple_index_file.cc b/net/disk_cache/simple/simple_index_file.cc
index 7925a7adc33a9ec68df75996990a6d749be7678e..3557a616068ca544832c1c8ba54478946c8d5b07 100644
--- a/net/disk_cache/simple/simple_index_file.cc
+++ b/net/disk_cache/simple/simple_index_file.cc
@@ -120,7 +120,10 @@ bool WritePickleFile(base::Pickle* pickle, const base::FilePath& file_name) {
 
 // Called for each cache directory traversal iteration.
 void ProcessEntryFile(SimpleIndex::EntrySet* entries,
-                      const base::FilePath& file_path) {
+                      const base::FilePath& file_path,
+                      base::Time last_accessed,

[jkarlin, 2017/03/27 14:09:15]

Could we instead take a 'const base::FileInfo& file_info' here?

[Maks Orlovich, 2017/03/27 15:25:44]

We don't have a base::FileInfo on the Windows path --- we have a
base::FileEnumerator::FileInfo, which is a different type.

(Not using FileEnumerator on POSIX appears to be done on purpose:

https://chromium.googlesource.com/chromium/src/+/139e21b4cc0ca376b3fdcd13821e...
)

+                      base::Time last_modified,
+                      int64_t size) {
   static const size_t kEntryFilesLength =
       kEntryFilesHashLength + kEntryFilesSuffixLength;
   // Converting to std::string is OK since we never use UTF8 wide chars in our
@@ -138,22 +141,17 @@ void ProcessEntryFile(SimpleIndex::EntrySet* entries,
     return;
   }
 
-  File::Info file_info;
-  if (!base::GetFileInfo(file_path, &file_info)) {
-    LOG(ERROR) << "Could not get file info for " << file_path.value();
-    return;
-  }
   base::Time last_used_time;
 #if defined(OS_POSIX)
   // For POSIX systems, a last access time is available. However, it's not
   // guaranteed to be more accurate than mtime. It is no worse though.
-  last_used_time = file_info.last_accessed;
+  last_used_time = last_accessed;
 #endif
   if (last_used_time.is_null())
-    last_used_time = file_info.last_modified;
+    last_used_time = last_modified;
 
   SimpleIndex::EntrySet::iterator it = entries->find(hash_key);
-  base::CheckedNumeric<uint32_t> total_entry_size = file_info.size;
+  base::CheckedNumeric<uint32_t> total_entry_size = size;
 
   if (it == entries->end()) {
     SimpleIndex::InsertInEntrySet(