Initial checkin of OfflineContentProvider.

components/offline_content/core/offline_item_file_extension.h

+// Copyright 2017 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.
+
+#ifndef COMPONENTS_OFFLINE_CONTENT_CORE_OFFLINE_ITEM_FILE_EXTENSION_H_
+#define COMPONENTS_OFFLINE_CONTENT_CORE_OFFLINE_ITEM_FILE_EXTENSION_H_
+
+namespace offline_content {
+
+// A Java counterpart will be generated for this enum.
+// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.offline_content.core.item
+enum OfflineItemFileExtension {
+  FILE_EXTENSION_OTHER = 0,

[qinmin, 2017/02/14 07:37:20]

are these extensions for FILTER_DOCUMENT? Why not using mime type?

[David Trainor- moved to gerrit, 2017/02/22 01:23:13]

I pulled this (practically all) of the fields from the current Java UI.  This is
used to store a UMA histogram on the Java side.  I can remove this for now and
add it back if/when we need it.  I do think we want to keep the histograms but
we may be able to move it to C++ instead (if we migrate the share option back
through the provider).

+  FILE_EXTENSION_APK = 1,

[qinmin, 2017/02/14 07:37:20]

you can remove all the numbers here and below

[David Trainor- moved to gerrit, 2017/02/22 01:23:13]

Done.

+  FILE_EXTENSION_CSV = 2,
+  FILE_EXTENSION_DOC = 3,
+  FILE_EXTENSION_DOCX = 4,
+  FILE_EXTENSION_EXE = 5,
+  FILE_EXTENSION_PDF = 6,
+  FILE_EXTENSION_PPT = 7,
+  FILE_EXTENSION_PPTX = 8,
+  FILE_EXTENSION_PSD = 9,
+  FILE_EXTENSION_RTF = 10,
+  FILE_EXTENSION_TXT = 11,
+  FILE_EXTENSION_XLS = 12,
+  FILE_EXTENSION_XLSX = 13,
+  FILE_EXTENSION_ZIP = 14,
+  FILE_EXTENSION_BOUNDARY = 15,
+};
+
+}  // namespace offline_content
+
+#endif  // COMPONENTS_OFFLINE_CONTENT_CORE_OFFLINE_ITEM_FILE_EXTENSION_H_