Move media library path resolution into Chrome path provider.

media/base/media.h

 // Copyright (c) 2010 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.
 
 // Contains code that should be used for initializing, or querying the state
 // of the media library as a whole.
 
 #ifndef MEDIA_BASE_MEDIA_H_
 #define MEDIA_BASE_MEDIA_H_
 
 class FilePath;
 
 namespace media {
 
 // Attempts to initialize the media library (loading DLLs, DSOs, etc.).
+//
 // If |module_dir| is the emptry string, then the system default library paths
 // are searched for the dynamic libraries.  If a |module_dir| is provided, then
 // only the specified |module_dir| will be searched for the dynamic libraries.
 //
+// If multiple initializations are attempted with different |module_dir|s
+// specified then the first one to succeed remains effective for the lifetime
+// of the process.
+//
 // Returns true if everything was successfully initialized, false otherwise.
 bool InitializeMediaLibrary(const FilePath& module_dir);
 
+// Use this if you need to check whether the media library is initialized
+// for the this process, without actually trying to initialize it.
+bool IsMediaLibraryInitialized();
+
 // Attempts to initialize OpenMAX library.
 //
 // Returns true if OpenMAX was successfully initialized and loaded.
 bool InitializeOpenMaxLibrary(const FilePath& module_dir);
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_H_