Introduce an eGL base helper class which provides an eGL context based on a
passed width and height.
The initGLContext function could be overloaded to provide an interface to a
real display.
A set of helper functions is provided to compile and link GLSL shaders.
linkShaderProgram currently compiles vertex/fragment pairs but could be
overloaded or passed a parameter to link a compute shader instead.
Breaking the eGL interface away from debayering - allows to use the eGL
context inside of a dma-buf heap cleanly, reuse that context inside of a
debayer layer and conceivably reuse the context in a multi-stage shader
pass.
Small note the image_attrs[] array doesn't pass checkstyle.py however the
elements of the array are in pairs.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
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