The code of solving cover titlebar will input new problem. Revert it.
Revert code commit id: cee74968

When a toast window show on the android, show it on pc too.

if mouse clicks are in titlebar and titlebar is covered by app's frame, disable titlebar function and send click
message to android to do app function.

fix problem, some apps's main window renderers will overflow window, this will cause black areas appearing four sides of the window, solve it.
tests: change two layer_composer test cases to make sucess, and add new two test cases.

Window move to left or right or bottom border and exceeds the screen border
by user, then the window moves to the origin position, a black edge will appear.

For debugging and development purposes it's sometimes useful to run the
full Android system in a single and statically sized window. This is not
going to be a widely used mode but can be helpful at times.

Also makes our window/layer management a bit more modular to allow easy
additions of new strategies/impementations.

As a window can be built out of multiple layers we need to take one as
the primary one which covers the entire window area. As it is not
guranteed that the layer size will match the actual window size cause
of synchronizaton delays with the Android side window manager we take
the layer as primary which covers the largest screen area. This should
solve most issues.

This gets us rid of one unneeded socket based communication point which
we kept around for historic reasons (from Android QEMU) but don't really
need in our case. This allows a simplication of our setup and improves
performance.