Test that CanvasManager tracks creation and destruction of WebGL shader programs.


== Running test suite: Canvas.ShaderProgram.webgl
-- Running test case: Canvas.ShaderProgram.webgl.reloadPage
PASS: Added ShaderProgram.
PASS: ShaderProgram should have a parent Canvas.

-- Running test case: Canvas.ShaderProgram.webgl.ShaderProgramAdded
PASS: Added ShaderProgram.
PASS: ShaderProgram should have a parent Canvas.
PASS: Removed ShaderProgram.
PASS: ShaderProgram should have a parent Canvas.
PASS: Removed the previously added ShaderProgram.

-- Running test case: Canvas.ShaderProgram.webgl.ParentCanvasRemoved
PASS: Removed ShaderProgram.
PASS: ShaderProgram should have a parent Canvas.
PASS: Removed ShaderProgram before Canvas.