Add property to check if user forces L3

[ Merge of go/wvgerrit/186611 ]

Android user can set the property using the developer option.

Bug: 301669353
Change-Id: I730b635f6cc28dfb0471c1d679627c94b9e16af1

libwvdrmengine/cdm/core/include/properties.h

@@ -82,6 +82,8 @@ class Properties {
   static bool GetSandboxId(std::string* sandbox_id);
   static bool AlwaysUseKeySetIds();
   static bool UseProviderIdInProvisioningRequest();
+  // Cdm only loads L3 library when this returns true
+  static bool ForceL3();
 
   static bool GetSecurityLevelDirectories(std::vector<std::string>* dirs);
   static bool GetApplicationId(const CdmSessionId& session_id,