This patch intends to implement all geometry shader related
resource queries on OpenGL back-ends.

This patch also fixes a memory leak by releasing the geometry
shader compiler handle in the destructor of the Compiler.

BUG=angleproject:1941, angleproject:2261
TEST=angle_end2end_tests

Change-Id: Ieb69c162d2fc6c6550e145d1ec7948c3d36d4d15
Reviewed-on: https://chromium-review.googlesource.com/784552Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>