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tsconfig.json files are similar to BUILD files. We can use them to
specify the list of files to compile as well as compiler options.

We'll need them later when we add support for depending on other
mojo targets.

Sample generated tsconfig.json

{
  "compilerOptions": {
    "lib": [
      "es6",
      "esnext.bigint"
    ],
    "module": "es6",
    "strict": true,
    "target": "es6"
  },
  "files": [
    "constants.test-mojom-lite.m.ts",
    "enums.test-mojom-lite.m.ts",
    "export1.test-mojom-lite.m.ts",
    "export2.test-mojom-lite.m.ts",
    "export3.test-mojom-lite.m.ts",
    "export4.test-mojom-lite.m.ts",
    "import.test-mojom-lite.m.ts",
    "module.test-mojom-lite.m.ts",
    "structs.test-mojom-lite.m.ts",
    "other_dir/other_dir.test-mojom-lite.m.ts"
  ]
}

Bug: 1002798
Change-Id: I1155d038c93718f706724c99604e2e46917c9b92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2245855Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781689}