I found it, the tricky part was there are so many repos just listed there on their git repo page (http://git.eclipse.org/c/), you kind of have to inspect each page, it is listed under the category "platform", as opposed to all the plugin ID's being listed in alphabetic order:

For org.eclipse.debug.core (where IProcess is), it is here:

http://git.eclipse.org/c/platform/eclipse.platform.debug.git/tree/org.eclipse.debug.core

Answer from Zombies on Stack Overflow

I found it, the tricky part was there are so many repos just listed there on their git repo page (http://git.eclipse.org/c/), you kind of have to inspect each page, it is listed under the category "platform", as opposed to all the plugin ID's being listed in alphabetic order:

For org.eclipse.debug.core (where IProcess is), it is here:

http://git.eclipse.org/c/platform/eclipse.platform.debug.git/tree/org.eclipse.debug.core

Answer from Zombies on Stack Overflow
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