[cc-frame-viewer] Add gl-matrix to third_party [redux]

tools/cc-frame-viewer/third_party/gl-matrix/README.md

Index: tools/cc-frame-viewer/third_party/gl-matrix/README.md
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+glMatrix
+=======================
+
+Javascript has evolved into a language capable of handling realtime 3D graphics, 
+via WebGL, and computationally intensive tasks such as physics simulations.
+These types of applications demand high performance vector and matrix math,
+which is something that Javascript doesn't provide by default.
+glMatrix to the rescue!
+
+glMatrix is designed to perform vector and matrix operations stupidly fast! By
+hand-tuning each function for maximum performance and encouraging efficient
+usage patterns through API conventions, glMatrix will help you get the most out
+of your browsers Javascript engine.
+
+Learn More
+----------------------
+For documentation, news, tutorials, and more visit the [glMatrix Homepage](http://glmatrix.net/)