Add glMatrix to third_party.

Some of our web tests and demos will make use of this library, and it's
useful to leverage a local copy instead of a CDN during development.

libs/filamentjs/tests/test.py

@@ -10,13 +10,15 @@
 ROOT_DIR = os.path.realpath(SCRIPT_DIR + "/../../../")
 BUILD_DIR = ROOT_DIR + "/out/cmake-webgl-release"
 SERVE_DIR = BUILD_DIR + "/libs/filamentjs"
+GLMATRIX_DIR = ROOT_DIR + "/third_party/gl-matrix"
 PORT = 8000
 
 # Copy assets used for testing into the server folder.
 
 src_assets = (
   glob.glob(BUILD_DIR + "/samples/web/public/material/*") +
   glob.glob(BUILD_DIR + "/samples/web/public/monkey/*") +
+  glob.glob(GLMATRIX_DIR + "/*.js") +
   glob.glob(SCRIPT_DIR + "/testwasm.*"))
 
 for src in src_assets:

third_party/gl-matrix/LICENSE.md

@@ -0,0 +1,19 @@
+Copyright (c) 2015-2018, Brandon Jones, Colin MacKenzie IV.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

third_party/gl-matrix/VERSION

@@ -0,0 +1 @@
+2.8.1

third_party/gl-matrix/tnt/README.md

@@ -0,0 +1,7 @@
+This is [glMatrix](http://glmatrix.net/) from [toji](https://github.com/toji), a small but
+well designed JavaScript library for vector math.
+
+curl \
+  -O https://unpkg.com/[email protected]/dist/gl-matrix-min.js \
+  -O https://unpkg.com/[email protected]/LICENSE.md \
+  -O https://unpkg.com/[email protected]/VERSION