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/src/properties_android.cpp

@@ -10,11 +10,13 @@
 #include <string>
 
 #include <android-base/properties.h>
+#include <android/sysprop/WidevineProperties.sysprop.h>
 
 #include "log.h"
 #include "wv_android_constants.h"
 #include "widevine_apex_info.h"
 
+using namespace android::sysprop;
 namespace {
 
 const char kBasePathPrefix[] = "/data/vendor/mediadrm/IDM";
@@ -211,4 +213,8 @@ bool Properties::AlwaysUseKeySetIds() { return false; }
 
 bool Properties::UseProviderIdInProvisioningRequest() { return false; }
 
+bool Properties::ForceL3() {
+  return WidevineProperties::forcel3_enabled().value_or(false);
+}
+
 }  // namespace wvcdm