Media Galleries: Initial media scanner implementation.

chrome/browser/media_galleries/fileapi/media_path_filter.h

Index: chrome/browser/media_galleries/fileapi/media_path_filter.h
===================================================================
--- chrome/browser/media_galleries/fileapi/media_path_filter.h	(revision 247534)
+++ chrome/browser/media_galleries/fileapi/media_path_filter.h	(working copy)
@@ -5,10 +5,13 @@
 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_PATH_FILTER_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_PATH_FILTER_H_
 
+#include <string>
 #include <vector>
 
+#include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/sequence_checker.h"
+#include "chrome/browser/media_galleries/media_scan_types.h"
 
 // This class holds the list of file path extensions that we should expose on
 // media filesystem.
@@ -16,17 +19,32 @@
  public:
   MediaPathFilter();
   ~MediaPathFilter();
+
+  // Returns true if |path| is a media file.
   bool Match(const base::FilePath& path);
 
+  // Returns the type of |path| or MEDIA_GALLERY_SCAN_FILE_TYPE_UNKNOWN if it
+  // is not a media file.
+  MediaGalleryScanFileType GetType(const base::FilePath& path);
+
  private:
   typedef std::vector<base::FilePath::StringType> MediaFileExtensionList;
+  typedef base::hash_map<base::FilePath::StringType, MediaGalleryScanFileType>
+      MediaFileExtensionMap;
 
   void EnsureInitialized();
 
+  static void GetMediaExtensionList(const std::string& mime_type,
+                                    MediaFileExtensionList* extensions);
+
+  void AddExtensionsToMediaFileExtensionMap(
+      const MediaFileExtensionList& extensions,
+      MediaGalleryScanFileType type);
+
   // Checks |initialized_| is only accessed on one sequence.
   base::SequenceChecker sequence_checker_;
   bool initialized_;
-  MediaFileExtensionList media_file_extensions_;
+  MediaFileExtensionMap media_file_extensions_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaPathFilter);
 };