Also regarded as magnification activated when it is forced to show magnification bounds

When fullscreen magnification is showing initially, it would force to
show magnification bounds but not not be magnifying first.
Then a user has to perform one tap to make the magnifier scaling.
For this case, we also think that it is magnification activated when the
magnification bounds are showing but not magnifying.

Bug: 181597348
Test: atest MagnificationControllerTest;atest FullScreenMagnificationControllerTest
Change-Id: I90b34cc25aca636d4ac84f6627d1a674faecbb1c