Update immersive confirmation.

1. Disable panic mechanism for expanded desktop.
2. Separate confirmation for each expanded desktop style.
3. Add new layout for the case when navigation
   bar is hidden but statusbar is visible.

Change-Id: I5914d655bd5f9315ac4cc6fc7d70cc4ee45bb7b2
Fixed incorrect calculation of dirty invalidation area

Padding was already taken into consideration before calling
invalidateDrawable in ProgressBar.

Change-Id: I75f25b0b7ee87d394422c58888ed3a1cca5d06a8
Fix error checking in MemoryFile.

mmap returns MAP_FAILED on failures, not 0 (NULL).
Also, convert some C style casts to C++ since they
make intent clearer.

Change-Id: I367993c73e9ee576f11ebe76e530d2c2f27c662d