opengl emulator : GLESv2 handling in the test egl implementation

Handle GLESv2 rendering in the emulator:
* load and initialize GLESv2 encoder library
* hide request for GLESv2 surfaces and contexts from the emulator
native implementation
* communicate the context/surface version configuration to the rendering
server

Change-Id: I9226275fc4a24983767735bdf19ddafbe9d07f34
3 files changed