[vscode-torque] Add vscode extension with basic Torque support.

This CL creates the "tools/torque" directory. It moves the existing
two scripts (making the parser and formatting Torque code) into that
director.

The extension lives in "tools/torque/vscode-torque" and currently only
provides basic syntax highlighting support. The easiest way to
install the extension is to simply create a symlink into your local
vscode extension directory (see README.md).

R=jgruber@chromium.org, tebbi@chromium.org

Change-Id: Ifc22b615341ed18f91c9b046090f569fcc083ab6
Reviewed-on: https://chromium-review.googlesource.com/1076548
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53421}

tools/torque/vscode-torque/README.md

+# Torque syntax support
+
+This extensions adds rudimentary syntax highlighting support for the WIP
+Torque language used in V8.
+
+## Installation
+
+Since the extension is not published to the marketplace, the easiest way to
+install the extension is to symlink the extension to your local extension
+directory:
+
+```
+ln -s $V8/tools/torque/vscode-torque $HOME/.vscode/extensions/vscode-torque
+```
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tools/torque/vscode-torque/language-configuration.json

+{
+    "comments": {
+        "lineComment": "//",
+        "blockComment": [ "/*", "*/" ]
+    },
+    "brackets": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"]
+    ],
+    "autoClosingPairs": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"],
+        ["\"", "\""],
+        ["'", "'"]
+    ],
+    "surroundingPairs": [
+        ["{", "}"],
+        ["[", "]"],
+        ["(", ")"],
+        ["\"", "\""],
+        ["'", "'"]
+    ]
+}
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tools/torque/vscode-torque/package.json

+{
+    "name": "vscode-torque",
+    "displayName": "Torque syntax support",
+    "description": "Basic Torque syntax highlighting support",
+    "version": "0.0.1",
+    "publisher": "szuend",
+    "engines": {
+        "vscode": "^1.22.0"
+    },
+    "categories": [
+        "Languages"
+    ],
+    "contributes": {
+        "languages": [{
+            "id": "torque",
+            "aliases": ["Torque", "torque"],
+            "extensions": [".tq"],
+            "configuration": "./language-configuration.json"
+        }],
+        "grammars": [{
+            "language": "torque",
+            "scopeName": "source.torque",
+            "path": "./syntaxes/torque.tmLanguage.json"
+        }]
+    }
+}
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tools/torque/vscode-torque/syntaxes/torque.tmLanguage.json

+{
+	"$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
+	"name": "Torque",
+	"patterns": [
+		{
+			"include": "#keywords"
+		},
+		{
+			"include": "#strings"
+		},
+		{
+			"name": "comment.line.double-slash.torque",
+			"begin": "//",
+			"end": "$"
+		},
+		{
+			"name": "comment.block.torque",
+			"begin": "/\\*",
+			"end": "\\*/"
+		},
+		{
+			"name": "string.quoted.single.torque",
+			"begin": "'",
+			"end": "'",
+			"patterns": [
+				{
+					"name": "constant.character.escape.torque",
+					"match": "\\\\."
+				}]
+		},
+		{
+			"name": "support.function.torque",
+			"match": "\\b(min|max|assert|check|debug|unreachable)\\b"
+		},
+    {
+      "name": "support.variable.torque",
+      "match": "\\b(true|True|false|False|Undefined|Hole|Null)\\b"
+    },
+    {
+      "begin": "<(?=[A-Za-z][0-9A-Za-z_]*>)",
+      "end": ">",
+      "patterns": [
+        {
+          "name": "support.type.torque",
+          "match": "([A-Za-z][0-9A-Za-z_]*)"
+        }
+      ]
+    },
+    {
+      "begin": ":(\\s*)?",
+      "end": "(?=[^0-9A-Za-z_])",
+      "patterns": [
+        {
+          "name": "support.type.torque",
+          "match": "([A-Za-z][0-9A-Za-z_]*)"
+        }
+      ]
+    }
+	],
+	"repository": {
+		"keywords": {
+			"patterns": [{
+				"name": "keyword.control.torque",
+				"match": "\\b(if|else|while|for|return|continue|break|goto|otherwise|try|catch)\\b"
+			},
+			{
+				"name": "keyword.other.torque",
+				"match": "\\b(constexpr|module|macro|builtin|runtime|javascript|implicit|deferred|cast|convert|label|labels|tail|isnt|is|let|generates|type|extends|extern|const)\\b"
+			},
+			{
+				"name": "keyword.operator.torque",
+				"match": "\\b(=|\\*=)\\b"
+			}]
+		},
+		"strings": {
+			"name": "string.quoted.double.torque",
+			"begin": "\"",
+			"end": "\"",
+			"patterns": [
+				{
+					"name": "constant.character.escape.torque",
+					"match": "\\\\."
+				}
+			]
+		}
+	},
+	"scopeName": "source.torque"
+}
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