This was required because we need a way to set the preferred activity for a
particular intent filter based on user selection (in our case the
ACTION_WEB_SEARCH intent filter for selecting the preferred search engine from
the list of available search engines providers). The current
addPreferredActivity call was not sufficient since it leaves the existing
preferred activities in the list and does not remove them, which this call
does.
You can now use android:testOnly="true" to not allow your .apk to be installed
as a normal app. The only way to do so is with the pm command and giving the
-t option, which sets a new INSTALL_ALLOW_TEST flag when installing.
I also used this to clean up the install API... actually, mostly to hide
it, since it is not accessible to apps so shouldn't be in the SDK. We
will be doing some more work on it, so this will prevent adding yet
another backwards-compatibility-for-no-reason version.
