Switch the order of constrained and layer drop mode,
and keep constrained_layer_drop as the default.
Update the svc datarate tests.
Change-Id: I764270f7b4964b87b0cd3da6c2f96a628f212a30
The control is set by log2 of number of threads (such that the number of
tiles is the same of number of threads).
Thus it should be log2(num_threads) instead of (num_threads >> 1).
Change-Id: I2ccec5557e660048dad3e561534e1c74fc8eec1f
As we add more tests to datarate_test.cc, it's growing bigger and hard
to find specific test.
Split it to vp8, vp9 and svc ones.
Change-Id: Ie8c302010cf304a95554bee19d87ddc90498d0fb
