[Rendering] Supporting Webgl.
[Rendering] Merged TIZEN_ACCELERATED_2D_CANVAS_EFL.
[Rendering] Merged TIZEN_CANVAS_CAIRO_GLES_RENDERING. (Not working yet.)
[Rendering] Merged TIZEN_CANVAS_CAIRO_GLES_RENDERING. #2 (It's working partially.)

Some canvas benchmark sites are not working but it looks cairo or driver issue.
("W/Adreno-ES20 (14941): <core_glTexSubImage2D:575>: GL_INVALID_OPERATION")
I'll check this issue after merging other patch.
[Rendering] Merged TIZEN_JPEG_IMAGE_SCALE_DECODING.