Add check for new brave_enable_cdm_host_verification config option

If set to `true` via .npmrc, Widevine Host Verification will be enabled for the build
This functionality also requires brave/brave-core#515

Fixes #1310

lib/config.js

@@ -47,6 +47,7 @@ const Config = function () {
   this.channel = ''
   this.sccache = getNPMConfig(['sccache'])
   this.braveReferralsApiKey = getNPMConfig(['brave_referrals_api_key']) || ''
+  this.braveEnableCdmHostVerification = JSON.parse(getNPMConfig(['brave_enable_cdm_host_verification']) || false)
 }
 
 Config.prototype.buildArgs = function () {
@@ -82,6 +83,7 @@ Config.prototype.buildArgs = function () {
     chrome_version_string: this.chromeVersion,
     safebrowsing_api_endpoint: this.safeBrowsingApiEndpoint,
     brave_referrals_api_key: this.braveReferralsApiKey,
+    brave_enable_cdm_host_verification: this.braveEnableCdmHostVerification
   }
 
   if (process.platform === 'darwin') {