RFR: 8244212: Optionally download media and webkit libraries from latest openjfx EA build

[Kevin Rushforth]

On Sat, 27 Jun 2020 18:30:10 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> I have tested on Linux (Fedora 31) only.
>> It works as intended (with one test failure due to 15-ea+4 being too old now).
>> 
>> UPDATE_STUB_CACHE suggests there is some magic available to help manage the stub cache.
>> But as I could not find anything about it, that section in the documentation may need some love.
>
> WEBKIT-MEDIA-STUBS.md line 24:
> 
>> 23: ````
>> 24:     $projectDir/../caches/sdk/lib
>> 25: ````
> 
> I know the caches have been at this location in the past, but I find it intrusive if `$projectDir/..` is used, so my
> preference would be to have it at `$projectDir/caches` . But maybe there is a good reason for using .. ?

This is just documenting current behavior. We have many build scripts rely on this.

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PR: https://git.openjdk.java.net/jfx/pull/202