expose web3.metamask.watchAsset

app/scripts/lib/auto-reload.js

@@ -14,6 +14,23 @@ function setupDappAutoReload (web3, observable) {
         console.warn('MetaMask: web3 will be deprecated in the near future in favor of the ethereumProvider \nhttps://github.com/MetaMask/faq/blob/master/detecting_metamask.md#web3-deprecation')
         hasBeenWarned = true
       }
+      // setup wallet
+      if (key === 'metamask') {
+        return {
+          watchAsset: (params) => {
+            return new Promise((resolve, reject) => {
+              web3.currentProvider.sendAsync({
+                jsonrpc: '2.0',
+                method: 'metamask_watchAsset',
+                params,
+              }, (err, res) => {
+                if (err) reject(err)
+                resolve(res)
+              })
+            })
+          },
+        }
+      }
       // get the time of use
       lastTimeUsed = Date.now()
       // return value normally