RFR: 8240264: iOS: Unnecessary logging on every pulse when GL context changes [v3]

[Kevin Rushforth]

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On Sun, 28 Jun 2020 18:34:01 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> This PR comments out too verbose console logging, as it has been done with some other fprintf calls.
>> As a follow up of this PR, a custom directive that enables this output if needed can be considered.
>
> Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Restore initial printout

Marked as reviewed by kcr (Lead).

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PR: https://git.openjdk.java.net/jfx/pull/165