Google drive forms should not appear in the "offline" tab of Files.app.

chrome/browser/chromeos/drive/search_metadata.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/drive/search_metadata.h"
 
 #include <algorithm>
 #include <queue>
 
 #include "base/bind.h"
 #include "base/i18n/string_search.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "content/public/browser/browser_thread.h"
+#include "google_apis/drive/gdata_wapi_parser.h"
 #include "net/base/escape.h"
 
 using content::BrowserThread;
 
 namespace drive {
 namespace internal {
 
 namespace {
 
 struct ResultCandidate {
@@ skipping 127 matching lines @@
     return false;
 
   if ((options & SEARCH_METADATA_EXCLUDE_DIRECTORIES) &&
       entry.file_info().is_directory())
     return false;
 
   if (options & SEARCH_METADATA_SHARED_WITH_ME)
     return entry.shared_with_me();
 
   if (options & SEARCH_METADATA_OFFLINE) {
-    if (entry.file_specific_info().is_hosted_document())
-      return true;
-    FileCacheEntry cache_entry;
-    it->GetCacheEntry(&cache_entry);
-    return cache_entry.is_present();
+    if (entry.file_specific_info().is_hosted_document()) {
+      // Not all hosted documents are cached by Drive offline app.
+      // http://support.google.com/drive/bin/answer.py?hl=en&answer=1628467
+      switch (google_apis::ResourceEntry::GetEntryKindFromExtension(
+          entry.file_specific_info().document_extension())) {
+        case google_apis::ENTRY_KIND_DOCUMENT:
+        case google_apis::ENTRY_KIND_SPREADSHEET:
+        case google_apis::ENTRY_KIND_PRESENTATION:
+        case google_apis::ENTRY_KIND_DRAWING:
+          return true;
+        default:
+          return false;
+      }
+    } else {
+      FileCacheEntry cache_entry;
+      it->GetCacheEntry(&cache_entry);
+      return cache_entry.is_present();
+    }
   }
 
   // Exclude "drive", "drive/root", and "drive/other".
   if (it->GetID() == util::kDriveGrandRootLocalId ||
       entry.parent_local_id() == util::kDriveGrandRootLocalId) {
     return false;
   }
 
   return true;
 }
@@ skipping 155 matching lines @@
   highlighted_text->append(net::EscapeForHTML(base::UTF16ToUTF8(pre)));
   highlighted_text->append("<b>");
   highlighted_text->append(net::EscapeForHTML(base::UTF16ToUTF8(match)));
   highlighted_text->append("</b>");
   highlighted_text->append(net::EscapeForHTML(base::UTF16ToUTF8(post)));
   return true;
 }
 
 }  // namespace internal
 }  // namespace drive