Move web-platform-tests to wpt (part 1 of 2)

third_party/WebKit/LayoutTests/imported/web-platform-tests/IndexedDB/idbworker.js

-var db
-
-self.addEventListener('message', MessageHandler, false)
-
-function MessageHandler(e)
-{
-    var open_rq, idb = self.indexedDB || self.msIndexedDB || self.webkitIndexedDB || self.mozIndexedDB
-
-    if (!idb)
-    {
-        self.postMessage(false)
-        return
-    }
-    else
-        self.postMessage(true)
-
-    open_rq = idb.open("webworker101", 1)
-
-    open_rq.onupgradeneeded = function(e) {
-        db = e.target.result
-        db.createObjectStore("store")
-          .add("test", 1)
-    }
-    open_rq.onsuccess = function(e) {
-        db = e.target.result
-        db.onerror = function() { self.postMessage("db.error") }
-        db.transaction("store").objectStore("store").get(1).onsuccess = function(e) {
-            self.postMessage(e.target.result)
-            db.close()
-        }
-    }
-    open_rq.onerror = function() { self.postMessage("open.error") }
-    open_rq.onblocked = function() { self.postMessage("open.blocked") }
-}