Reinforce bitmap reconfiguration on Android

Reinforce bitmap reconfiguration on Android

* java/org/gnu/emacs/EmacsView.java (EmacsView) <unswapped>: New
field in which to record whether the back buffer has received
contents beyond those present at the last buffer swap.
<dimensionsLock>: Delete field.
(onAttachedToWindow, onLayout, handleDirtyBitmap)
(prepareForLayout): Rather, synchronize window dimensions with
the view.
(getCanvas, getBitmap): Do not reconfigure the back buffer
bitmap if such outstanding data exists.
(postSwapBuffers): New function.
(swapBuffers): If such outstanding data exists and the back
bufferis pending reconfiguration, recreate the back buffer and
report exposure.

* src/androidterm.c (handle_one_android_event): Fix indentation.

(cherry picked from commit 82f0014273193d27c71a1fcb9be778c85cfa5e65)