[fsp] Add a method to enumerate all mounted file systems.

chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h

Index: chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
diff --git a/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h b/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
index 96a444edc8ddfb53a82e6dafb5adc924b58eee9e..3085ecc6b86e62ac78760f222a0edaf9b796c2e4 100644
--- a/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
+++ b/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h
@@ -30,6 +30,16 @@ class FileSystemProviderUnmountFunction : public ChromeSyncExtensionFunction {
   virtual bool RunSync() OVERRIDE;
 };
 
+class FileSystemProviderGetAllFunction : public ChromeSyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("fileSystemProvider.getAll",
+                             FILESYSTEMPROVIDER_GETALL)
+
+ protected:
+  virtual ~FileSystemProviderGetAllFunction() {}
+  virtual bool RunSync() OVERRIDE;
+};
+
 class FileSystemProviderInternalUnmountRequestedSuccessFunction
     : public FileSystemProviderInternalFunction {
  public: