Ctrl+S Save where ever you like (Applications folder?).open -a "Chromium.app" -args -ppapi-flash-path=/Library/Internet\ Plug-Ins/PepperFlashPlayer/ugin -ppapi-flash-version=19.0.0.226.Library -> Utilities -> Run Shell Script.Create a new document of type Application.Create a Dock launch icon for that command with Automator:.This preferences won't be a default, I tried changing chrome://flags, plugins, components, but nothing stayed for next run. Here is where you put the version that you copied from the Adobe website.
Applications/Chromium.app/Contents/MacOS/Chromium -ppapi-flash-path=/Library/Internet\ Plug-Ins/PepperFlashPlayer/ugin -ppapi-flash-version=19.0.0.226
Download version for Mac OSX and Chromium.Copy the version number in a text-editor or Notes app.
Guess I'm just going to relegate Chromium to a dev browser that I don't use day-to-day. Also tried pointing it explicitly at the copy inside Chrome, and at the newer version installed by Adobe in "/Library/Internet plugins", to no avail. You can even manually edit ~/Library/Application Support/Chromium/Default/Preferences to point directly at the PPAPI Flash plugin, after copying it out of Chrome and putting it into /Applications/Chromium.app/Contents/Versions//Chromium amework/Internet Plug-Ins, mirroring the Chrome installation and Preferences file down to the last details in the plugins section of the JSON in the Preferences file, and it will not work. Not sure what version this broke in (I have been bouncing around between various Dev and Canary builds). This no longer works, as of September 2015 (and now Oct.) No matter what I do, the Mac version of Chromium will not do Flash.