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OpenGL compiles shader code as text at runtime. It is inconvienent to
edit shader code as const char[] inside the C++ source code.

This CL contains script that reads file contents, turns them into const
char[], and combine them into a header file.

BUG=385924

Review-Url: https://codereview.chromium.org/2036023003
Cr-Commit-Position: refs/heads/master@{#398142}