Reland of r266437: [Files.app] Use getDriveEntryProperties() to retrieve metadata

This is a reland of r260688, which is reverted due to last-minute rebase mistake. 

Previously, we used FileEntry.getMetadata() to retrieve filesystem metadata and getDriveEntryProperties() to get Drive metadata, so we need 2 calls for 1 file on Drive. 

With this patch, getDriveEntryProperties() returns not only Drive metadata but also filesystem metadata. It's enough to call only getDriveEntryProperties() and we can reduce a number of calls by half. 

BUG=345196
TEST=browser_test passes. 
R=asargent@chromium.org, hashimoto@chromium.org, hirono@chromium.org 
TBR=asargent@chromium.org, hashimoto@chromium.org, hirono@chromium.org 
NOTRY=True
# NOTRYing for buildbots already passes (see. crrev.com/256023002)

Review URL: https://codereview.chromium.org/256023002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266795 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/extensions/file_manager/private_api_drive.cc

@@ -54,6 +54,11 @@ void FillDriveEntryPropertiesValue(const drive::ResourceEntry& entry_proto,
   properties->shared_with_me.reset(new bool(shared_with_me));
   properties->shared.reset(new bool(entry_proto.shared()));
 
+  const drive::PlatformFileInfoProto& file_info = entry_proto.file_info();
+  properties->file_size.reset(new double(file_info.size()));
+  properties->last_modified_time.reset(new double(
+      base::Time::FromInternalValue(file_info.last_modified()).ToJsTime()));
+
   if (!entry_proto.has_file_specific_info())
     return;
 

chrome/common/extensions/api/file_browser_private.idl

@@ -162,6 +162,12 @@ dictionary FileTask {
 
 // Drive file properties.
 dictionary DriveEntryProperties {
+  // Size of this file.
+  double? fileSize;
+
+  // Timestamp of entry update time, in milliseconds past the epoch.
+  double? lastModifiedTime;
+
   // URL to the Drive thumbnail image for this file.
   DOMString? thumbnailUrl;
 

ui/file_manager/file_manager/foreground/js/metadata/metadata_cache.js

@@ -115,8 +115,10 @@ MetadataCache.EVICTION_THRESHOLD_MARGIN = 500;
  */
 MetadataCache.createFull = function(volumeManager) {
   var cache = new MetadataCache();
-  cache.providers_.push(new FilesystemProvider());
+  // DriveProvider should be prior to FileSystemProvider, because it covers
+  // FileSystemProvider for files in Drive.
   cache.providers_.push(new DriveProvider(volumeManager));
+  cache.providers_.push(new FilesystemProvider());
   cache.providers_.push(new ContentProvider());
   return cache;
 };
@@ -681,7 +683,7 @@ FilesystemProvider.prototype.fetch = function(
   function onMetadata(entry, metadata) {
     callback({
       filesystem: {
-        size: entry.isFile ? (metadata.size || 0) : -1,
+        size: (entry.isFile ? (metadata.size || 0) : -1),
         modificationTime: metadata.modificationTime
       }
     });
@@ -735,7 +737,7 @@ DriveProvider.prototype.supportsEntry = function(entry) {
  */
 DriveProvider.prototype.providesType = function(type) {
   return type === 'drive' || type === 'thumbnail' ||
-      type === 'streaming' || type === 'media';
+      type === 'streaming' || type === 'media' || type === 'filesystem';
 };
 
 /**
@@ -838,6 +840,11 @@ DriveProvider.prototype.convert_ = function(data, entry) {
     shared: data.shared
   };
 
+  result.filesystem = {
+    size: (entry.isFile ? (data.fileSize || 0) : -1),
+    modificationTime: new Date(data.lastModifiedTime)
+  };
+
   if ('thumbnailUrl' in data) {
     result.thumbnail = {
       url: data.thumbnailUrl,