[FileManager] Do drive search incrementally

chrome/browser/chromeos/gdata/gdata_operations.cc

Index: chrome/browser/chromeos/gdata/gdata_operations.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_operations.cc b/chrome/browser/chromeos/gdata/gdata_operations.cc
index e0057eb392b823f9288ef945bfcda7c37497b55f..71d9166eca3268c182b3c875a9e63beb32fb5673 100644
--- a/chrome/browser/chromeos/gdata/gdata_operations.cc
+++ b/chrome/browser/chromeos/gdata/gdata_operations.cc
@@ -57,8 +57,10 @@ const char kUploadContentLength[] = "X-Upload-Content-Length: ";
 // almost always. Be careful not to use something too small on account that
 // have many items because server side 503 error might kick in.
 const int kMaxDocumentsPerFeed = 1000;
+const int kMaxDocumentsPerSearchFeed = 50;
 #else
 const int kMaxDocumentsPerFeed = 1000;
+const int kMaxDocumentsPerSearchFeed = 50;
 #endif
 
 const char kFeedField[] = "feed";
@@ -159,15 +161,18 @@ void GetDocumentsOperation::SetUrl(const GURL& url) {
 }
 
 GURL GetDocumentsOperation::GetURL() const {
+  int max_docs = search_string_.empty() ? kMaxDocumentsPerFeed :
+                                          kMaxDocumentsPerSearchFeed;
+
   if (!override_url_.is_empty())
     return AddFeedUrlParams(override_url_,
-                            kMaxDocumentsPerFeed,
+                            max_docs,
                             0,
-                            std::string());
+                            search_string_);
 
   if (start_changestamp_ == 0) {
     return AddFeedUrlParams(FormatDocumentListURL(directory_resource_id_),
-                            kMaxDocumentsPerFeed,
+                            max_docs,
                             0,
                             search_string_);
   }