Added shaderc, glslang, and SPIRV-Tools to third_party.

.gitignore

 *.gypcmd
 *.mk
 *.ncb
 *.opensdf
 *.orig
 *.pdb
 *.props
 *.pyc
 *.pyproj
 *.rules
@@ skipping 316 matching lines @@
 /third_party/errorprone/lib
 /third_party/eyesfree/src
 /third_party/ffmpeg
 /third_party/findbugs
 /third_party/flac
 /third_party/flatbuffers/src
 /third_party/fontconfig/src
 /third_party/freetype-android/src
 /third_party/freetype2/src
 /third_party/gles2_conform
+/third_party/glslang/src
 /third_party/gnu_binutils/
 /third_party/google_appengine_cloudstorage
 /third_party/google_toolbox_for_mac/src
 /third_party/googlemac
 /third_party/gperf
 /third_party/httpcomponents-client
 /third_party/httpcomponents-core
 /third_party/hunspell_dictionaries
 /third_party/icu
 /third_party/jarjar
@@ skipping 55 matching lines @@
 /third_party/python_24
 /third_party/python_26
 /third_party/pywebsocket/src
 /third_party/pywebsocket/src
 /third_party/re2/src
 /third_party/requests/src
 /third_party/robolectric/lib
 /third_party/safe_browsing/testing
 /third_party/scons-2.0.1
 /third_party/sfntly/src
+/third_party/shaderc/src
 /third_party/skia
 /third_party/smhasher/src
 /third_party/snappy/src
+/third_party/SPIRV-Tools/src
 /third_party/swiftshader/include/
 /third_party/syzygy
 /third_party/syzygy/binaries
 /third_party/tsan/
 /third_party/ub-uiautomator/lib
 /third_party/usb_ids
 /third_party/usrsctp/usrsctplib
 /third_party/v8-i18n
 /third_party/valgrind
 /third_party/v4l2capture
@@ skipping 41 matching lines @@
 /ui/keyboard/keyboard_mojom_bindings.xml
 /ui/surface/surface.xml
 /ui/surface/surface_gpu_tests.xml
 /v8
 /webkit/data
 /webpagereplay_logs/
 /win8/delegate_execute/delegate_execute_version_resources.xml
 /win8/metro_driver/metro_driver_version_resources.xml
 /x86-generic_out/
 /xcodebuild