Move media library path resolution into Chrome path provider.

media/base/media.h

Index: media/base/media.h
diff --git a/media/base/media.h b/media/base/media.h
index 3d1a83a2dda2ada638191cb36a5725d3345c2d08..6bbad4cbbb9ec9caa484c50c240091c41e1de712 100644
--- a/media/base/media.h
+++ b/media/base/media.h
@@ -13,13 +13,22 @@ 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.