Use "Files: list" for full fetch.

According to some investigation, "Files: list" should be faster than
"Changes: list". We can use this because we extract change list id from
"About: get" API.

BUG=287602
TEST=Ran unit_tests and tested manually.

WIP

Review URL: https://chromiumcodereview.appspot.com/23958006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222016 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/drive/change_list_loader.cc

@@ -58,12 +58,12 @@ class FullFeedFetcher : public ChangeListLoader::FeedFetcher {
 
     // This is full resource list fetch.
     scheduler_->GetAllResourceList(
-        base::Bind(&FullFeedFetcher::OnChangeListFetched,
+        base::Bind(&FullFeedFetcher::OnFileListFetched,
                    weak_ptr_factory_.GetWeakPtr(), callback));
   }
 
  private:
-  void OnChangeListFetched(
+  void OnFileListFetched(
       const FeedFetcherCallback& callback,
       google_apis::GDataErrorCode status,
       scoped_ptr<google_apis::ResourceList> resource_list) {
@@ -89,9 +89,9 @@ class FullFeedFetcher : public ChangeListLoader::FeedFetcher {
     GURL next_url;
     if (resource_list->GetNextFeedURL(&next_url) && !next_url.is_empty()) {
       // There is the remaining result so fetch it.
-      scheduler_->GetRemainingChangeList(
+      scheduler_->GetRemainingFileList(
           next_url,
-          base::Bind(&FullFeedFetcher::OnChangeListFetched,
+          base::Bind(&FullFeedFetcher::OnFileListFetched,
                      weak_ptr_factory_.GetWeakPtr(), callback));
       return;
     }

chrome/browser/drive/drive_api_service.cc

@@ -319,15 +319,12 @@ CancelCallback DriveAPIService::GetAllResourceList(
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
-  // The simplest way to fetch the all resources list looks files.list method,
-  // but it seems impossible to know the returned list's changestamp.
-  // Thus, instead, we use changes.list method with includeDeleted=false here.
-  // The returned list should contain only resources currently existing.
-  ChangesListRequest* request = new ChangesListRequest(
+  FilesListRequest* request = new FilesListRequest(
       sender_.get(), url_generator_,
-      base::Bind(&ConvertChangeListToResourceListOnBlockingPoolAndRun,
+      base::Bind(&ConvertFileListToResourceListOnBlockingPoolAndRun,
                  blocking_task_runner_, callback));
-  request->set_include_deleted(false);
+  request->set_max_results(kMaxNumFilesResourcePerRequest);
+  request->set_q("trashed = false");  // Exclude trashed files.
   return sender_->StartRequestWithRetry(request);
 }