Add Pepper Flash plugin support (issue #1586).
A system-wide installation of the Pepper Flash plugin is available from Adobe for Windows and Mac OS X platforms as a separate download. To enable automatic detection and loading of the system-wide installation pass the `--enable-system-flash` command-line flag. The Pepper Flash plugin can also be loaded by specifying the file path and version via the `--ppapi-flash-path=<path> --ppapi-flash-version=<version>` command-line flags. The version can be identified by viewing the manifest.json file in the same directory as the Pepper Flash plugin library.
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