Move content deduplication into the scan process.

ui/file_manager/file_manager/common/js/importer_common.js

Index: ui/file_manager/file_manager/common/js/importer_common.js
diff --git a/ui/file_manager/file_manager/common/js/importer_common.js b/ui/file_manager/file_manager/common/js/importer_common.js
index 00b41d7790d70aaab680355df076030b7754bf0e..65b5203686561ab2a6666616e9eeee1b3d03a183 100644
--- a/ui/file_manager/file_manager/common/js/importer_common.js
+++ b/ui/file_manager/file_manager/common/js/importer_common.js
@@ -13,6 +13,18 @@ importer.ScanEvent = {
 };
 
 /**
+ * Disposition of an entry with respect to it's
+ * presence in import history, drive, and so on.
+ * @enum {string}
+ */
+importer.Disposition = {
+  CONTENT_DUPLICATE: 'content-dupe',

[mtomasz, 2015/03/05 04:36:53]

nit: It's hard for me to understand this enum. What's SCAN_DUPLICATE? Isn't
history duplicate detected during scan?

[Steve McKay, 2015/03/05 21:39:04]

Scan duplicates are for duplicates detected only within a single scan result.

+  HISTORY_DUPLICATE: 'history-dupe',
+  ORIGINAL: 'original',

[mtomasz, 2015/03/05 04:36:53]

nit: What does it mean that disposition is original? How about renaming to
simply NEW?

[Steve McKay, 2015/03/05 21:39:04]

New doesn't seem much more explanatory.

+  SCAN_DUPLICATE: 'scan-dupe'
+};
+
+/**
  * Storage keys for settings saved by importer.
  * @enum {string}
  */