[Rev 01] RFR: 6689: Export (and print?) the flame graph

[Kangcheng Xu]

> This implements [JMC-6689: Export (and print?) the flame graph](https://bugs.openjdk.java.net/browse/JMC-6689)
> 
> Two actions were added to Flame View's menu bar, each for
> - saving the current flame graph to the local file system as a `.jpg` or `.png` file
> - sending the current flame graph to a printer (or to a `.pdf` file)
> 
> Please let me know your thoughts. Thank you very much!

The pull request has been updated with 1 additional commit.

-------------

Added commits:
 - 87198ac2: Update according to aptmac's review

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/56/files
  - new: https://git.openjdk.java.net/jmc/pull/56/files/5c6b70c3..87198ac2

Webrevs:
 - full: https://webrevs.openjdk.java.net/jmc/56/webrev.01
 - incr: https://webrevs.openjdk.java.net/jmc/56/webrev.00-01

  Stats: 11 lines in 2 files changed: 6 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jmc/pull/56.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/56/head:pull/56

PR: https://git.openjdk.java.net/jmc/pull/56