back</a>&nbsp;cb)</pre>
<div class="block">Starts a load for the given arguments. Must be called on the main thread.

 <p> The flow for any request is as follows: <ul> <li>Check the memory cache and provide the
 cached resource if present</li> <li>Check the current put of actively used resources and return
 the active resource if present</li> <li>Check the current put of in progress loads and add the
 cb to the in progress load if present</li> <li>Start a new load</li> </ul> </p>

 <p> Active resources are 