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We preload classes for two reasons. Classes that are popular can be
shared and can increase the number of apps that can be run concurrently.
Classes that initialize slowly can be initialized at system boot time
by the zygote, decreasing the time to launch a specific app.

To select which classes to preload, I exercised Android's built-in apps
as well as these apps from Market: ESPN score center, Amazon, Flixster,
Twitter, Adobe Reader, Ebay Mobile, Facebook, Solitare (Ken Magic),
Barcode Reader, Google Earth and Square.

A cycle of launching ~460 (non unique) activities in sequence took 9m35s
with the previous preloaded-classes list. The update improves the launch
time of the same sequence to 9m27s: the marginal improvement over the
previous set of preloaded classes is negligible.

http://b/3004763

Change-Id: Ida511ae31eeff6d95d9cb6aacae68b9bb9dd2ebe