Increase activity timeouts when using a wrapper process.

This patch enables the Zygote to tell the ActivityManager when
it has started a process with a wrapper attached so that the
ActivityManager can allow it extra time to start up or process
events.

This is useful when wrapping an app with Valgrind or other tools
which add significant runtime overhead.

Bug: 4584468
Change-Id: I5db6f2f15cd30b0ec40f547d2fadfa216de2926d