Merge remote-tracking branch 'aosp/upstream-master' into update-shaderc

Includes the following:
	2d89b6a Do not gitignore source/opt/build_module.*
	ee6c877 Test SPV_KHR_shader_draw_parameters support

Test: checkbuild.py for Linux, Windows; ran unit tests on Windows
Change-Id: Ica302fd13353d90b0745420a6d2b1a25d54a2297