Currently, null is sent when a 2D intent is running.
Sending the component name and a flag instead allows
VrCore to determine which intent is currently running
and which layers on the display correspond to this
application.
The process ID of the current intent is also sent,
to allow association of buffers to the VR app.
Bug: 63709047, 63115025
Test: manual with prints
Change-Id: I164b577f2c578867fb953d92074ef3d2d31221a1
16d2397e2d