[Review request] 8145143: Promote Image.impl_getUrl() to public API as Image.getUrl()

[Jonathan Giles]

Hi Chien, Kevin,

Please can you review the following JBS issue (and attached patch):

https://bugs.openjdk.java.net/browse/JDK-8145143

As the subject line states, this issue proposes to promote the 
Image.impl_getUrl() method to Image.getUrl(), so that it is public API.

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-- Jonathan