Revert 221982 "file_manager: Remove FileWatchChangedEntry from f..."

Broke DriveFileSystemExtensionApiTest.FileWatch
http://build.chromium.org/p/tryserver.chromium/builders/linux_chromeos/builds/151979


> file_manager: Remove FileWatchChangedEntry from fileBrowserPrivate
> 
> This type is not in use, and we don't plan to use this any time soon.
> We should add it back when it's needed.
> 
> BUG=257916
> TEST=Files.app works as before
> R=benwells@chromium.org, mtomasz@chromium.org
> 
> Review URL: https://codereview.chromium.org/23956009

TBR=satorux@chromium.org

Review URL: https://codereview.chromium.org/23791005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221990 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -685,6 +685,10 @@ void EventRouter::DispatchDirectoryChangeEvent(
     watch_info->SetString("eventType",
                           got_error ? kPathWatchError : kPathChanged);
 
+    // TODO(mtomasz): Pass set of entries. http://crbug.com/157834
+    ListValue* watch_info_entries = new ListValue();
+    watch_info->Set("changedEntries", watch_info_entries);
+
     scoped_ptr<extensions::Event> event(new extensions::Event(
         extensions::event_names::kOnDirectoryChanged, args.Pass()));
     extensions::ExtensionSystem::Get(profile_)->event_router()->

chrome/common/extensions/api/file_browser_private.json

@@ -304,6 +304,22 @@
           }
         }
       },
+      {
+        "id": "FileWatchChangedEntry",
+        "type": "object",
+        "description": "Information about changed file or directory",
+        "properties": {
+          "changeType": {
+            "type": "string",
+            "enum": ["added", "deleted", "updated"],
+            "description": "Specifies type of the change."
+          },
+          "fileUrl": {
+            "type": "string",
+            "description": "URL of the changed file."
+          }
+        }
+      },
       {
         "id": "FileWatchEvent",
         "type": "object",
@@ -317,6 +333,10 @@
           "directoryUrl": {
             "type": "string",
             "description": "URL of watched directory."
+          },
+          "changedEntries": {
+            "type": "array",
+            "items": {"$ref": "FileWatchChangedEntry"}
           }
         }
       }