OpenGL renderer: handling subwindow messages

On windows we need to have a thread on the renderer process
which handles windows messages sent to the subwindow
we are creating during framebuffer initialization.
We run this message pump in the main renderer thread
and the server listener on a seperate thread.

tools/emulator/opengl/host/libs/libOpenglRender/FrameBuffer.h

@@ -73,7 +73,7 @@ public:
 
     EGLDisplay getDisplay() const { return m_eglDisplay; }
     EGLContext getContext() const { return m_eglContext; }
-
+    EGLNativeWindowType getSubWindow() const { return m_subWin; }
     bool bind_locked();
     bool unbind_locked();