Add Call to Install Keybox to Widevine CDM

This merges the following changes from the Widevine CDM repository:

1a72a7e  Combine utility code into single library on Android
  Combines several previously-separate files into a static library,
  libcdm_utils, so that it can easily be used by both CDM and
  OEMCrypto.

8c4d04d  Install Keybox
  If the keybox has not been installed, install it from
  /factory/wv.keys.

Bug: 9972451
Change-Id: I8688ecd0adcf321e0c7d0faf55dd10f3910c12ec

libwvdrmengine/cdm/src/properties_android.cpp

@@ -92,4 +92,13 @@ bool Properties::GetDeviceFilesBasePath(std::string* base_path) {
   return true;
 }
 
+bool Properties::GetFactoryKeyboxPath(std::string* keybox) {
+  if (!keybox) {
+    LOGW("Properties::GetFactoryKeyboxPath: Invalid parameter");
+    return false;
+  }
+  *keybox = "/factory/wv.keys";
+  return true;
+}
+
 }  // namespace wvcdm