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/src/oemcrypto_adapter_dynamic.cpp

@@ -794,6 +794,7 @@ class Adapter {
           wvcdm::metrics::OEMCrypto_INITIALIZED_FORCING_L3);
       return result;
     }
+
     LOGI("L3 Initialized. Trying L1.");
     std::vector<std::string> library_names;
     if (!wvcdm::Properties::GetOEMCryptoPaths(&library_names)) {
@@ -1376,9 +1377,15 @@ class Adapter {
   std::mutex session_map_lock_;
   std::vector<uint8_t> sandbox_id_;
 
-  // For running the unit tests using the level 3 oemcrypto.  If the user sets
-  // the environment FORCE_LEVEL3_OEMCRYPTO, we ignore the level 1 library.
+  // First check if user sets force L3 property to be true. Then
+  // check if the user sets the environment FORCE_LEVEL3_OEMCRYPTO
+  // for running the unit tests using the level 3 oemcrypto.
+  // If any of above is true, we ignore the level 1 library.
   bool force_level3() {
+    if (wvcdm::Properties::ForceL3()) {
+      LOGW("User requested falling back to L3");
+      return true;
+    }
     const char* var = getenv("FORCE_LEVEL3_OEMCRYPTO");
     if (!var) return false;
     return !strcmp(var, "yes");