SystemUI: Recents window visual updates

* Changed the KillAll button to not have a border/be transparent
* Stretched out the RAM bar across the top, and add a small shadow underneath

PS4: Drop landscape related changes down
     from GNow commit (wrong patch)

Change-Id: Iabdab0a083b00ee51834415f0454f8298efe5591
SystemUI: GoogleNow in Recents

Hardcoded for now...
PS2: Not Hardcoded
     Layout-Land
     KillAll above GNow
PS3: Whitespace & Fix Dependency
PS4: GNow right of KillAll in Landscape
PS5: Drop relevant layout-land down
     to dependency
PS8: adjusted xml styling

Change-Id: I9be63197a48253b3d57a13981e458bede95c345c