Add support for remote contracts data pre-loading

lib/gasData.js

@@ -67,6 +67,14 @@ class GasData {
         }
       }
 
+      if (contract.artifact.bytecodeHash) {
+        this.trackNameByPreloadedAddress(
+          contract.name,
+          contract.artifact.address,
+          contract.artifact.bytecodeHash
+        );
+      }
+
       // Decode, getMethodIDs
       const methodIDs = {};
 
@@ -120,6 +128,17 @@ class GasData {
     this.addressCache[address] = name;
   }
 
+  /**
+   * Map a contract name to pre-generated hash of the code stored at an address
+   * @param  {String} name    contract name
+   * @param  {String} address contract address
+   */
+  trackNameByPreloadedAddress(name, address, hash) {
+    if (this.addressIsCached(address)) return;
+    this.codeHashMap[hash] = name;
+    this.addressCache[address] = name;
+  }
+
   /**
    * Get the name of the contract stored at contract address
    * @param  {String} address contract address