Support for Views framework

[cztomczak]

CEF views is a GUI framework built into CEF. It can act as a replacement for GUI libraries like PyQt, wxPython, PyGTK, that we could use in Hello World and Tutorial examples for simplicity. It has elements like: display, window, layout, button, panel, scroll view, textfield, among others. See the include/views/ directory for a complete list. Upstream issue #1749 added the views feature.

NOTE: CEF views do not support creating browser synchronously, but CEF Python currently only supports creating browser synchronously - there are a few cases that depend on it. See Marshall's response in this CEF topic: http://www.magpcss.org/ceforum/viewtopic.php?f=6&t=15006

UPDATE: Currently as of v64 CEF Views are still not supported on Mac. Only Windows and Linux platforms are supported.

Views framework todo

• In "src/client_handler/x11.cpp" in CefBrowser_GetGtkWindow return NULL when using the Views framework

hello_world.py / tutorial.py

Currently the Hello World / Tutorial examples have a few issues, that CEF views should fix:

• No window title - alredy fixed in Issue Support setting window title in hello_world.py example #339 by calling native Cocoa/X11 functions
• No icon
• On Mac the window is not activated (shows behind terminal) - see this topic for a temporary fix

offscreen.py

In CefWindow there are even functions for sending mouse/key events, so looks like this could allow creating a simple OSR example. However I don't see a way to draw using paint buffer.

Unit tests (#59)

Figure out if CEF views be of use in unit tests.