JDK-8303828: Fix for build break on Solaris due to missing class

[adamfarley]

Because Solaris currently lacks this class, the build breaks when compiling Metrics.java. Inserting a dummy class to fix that.

This takes the same approach as JDK-8303408, only on Solaris.

This change is being proposed directly to JDK8u because I'm not aware of Solaris platform support post-JDK8.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Integration blocker

 ⚠️ Title mismatch between PR and JBS for issue JDK-8303828

Issue

• JDK-8303828: [Solaris] Broken jdk8u build after JDK-8266391 ⚠️ Title mismatch between PR and JBS.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u-dev pull/280/head:pull/280
$ git checkout pull/280

Update a local copy of the PR:
$ git checkout pull/280
$ git pull https://git.openjdk.org/jdk8u-dev pull/280/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 280

View PR using the GUI difftool:
$ git pr show -t 280

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk8u-dev/pull/280.diff

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[mlbridge]

Webrevs

• 00: Full (fbefea33)

[jerboaa]

@adamfarley I think this fix warrants getting included in the 8u372 release as we did with JDK-8303408. Please propose a PR here instead: https://github.com/openjdk/jdk8u Thanks!

[adamfarley]

Good idea Severin. PR created.