vcl: Execute pending operations on source when copying bitmap

Change-Id: I8a6a5ffe71c9e5f16533fd1f0944d4fd2a051c73
vcl: Unbind framebuffer after setting offscreen mode

Change-Id: I057b148f51c8f011cb013e1f06288aec4d9bdb2a
windows opengl: Provide the context to textures everywhere where we have it.

Change-Id: Ib820326fdc752d0893840bad3eb7f1369469f796
vcl: remove old GetOpenGLContext method.

Change-Id: I1959b2e4aabdee92472fed31905fea44b989230d
windows opengl: Share the contexts as we do on Linux.

Change-Id: Ic58cca612cdf8f73170c18573917465bf34a187c
Kill check-merged.sh, 'git cherry' actually gives better results.

Change-Id: Ia4163f77f5267f6cb714369fc9a4cfbb901019df