Commits on May 29, 2020

1. Enable filtering visible nodes as an option …

   Currently, we cannot tell ChromeDP to select all visible nodes without
   waiting for them.
   
   If one calls
   ```
   NodeIDs(selector, WaitVisible, AtLeast(0))
   ```
   
   chromeDP selects all nodes with the selector and then wait for them to be visible.
   This might hang if it never happens and the node keeps being hidden.
   
   With this PR, we can do
   ```
   NodeIDs(selector, FilterVisible, AtLeast(0))
   ```
   
   However, the following will still hang, since the waiting is done before the filtering;
   as we need the nodes to be at least ready to filter them. I think it's OK,
   but it might be confusing.
   
   ```
   NodeIDs(selector, WaitVisible, FilterVisible, AtLeast(0))
   ```

   Karel Bilek committed May 29, 2020
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