Add textblock highlight support

Author: hopehadfield

language-support/java/java.tmLanguage.json

@@ -1571,6 +1571,31 @@
 		},
 		"strings": {
 			"patterns": [
+				{
+					"begin": "\"\"\"",
+					"beginCaptures": {
+						"0": {
+							"name": "punctuation.definition.string.begin.java"
+						}
+					},
+					"end": "\"\"\"",
+					"endCaptures": {
+						"0": {
+							"name": "punctuation.definition.string.end.java"
+						}
+					},
+					"name": "string.quoted.triple.java",
+					"patterns": [
+						{
+							"match": "\\\\\"\"\"",
+							"name": "constant.character.escape.java"
+						},
+						{
+							"match": "\\\\.",
+							"name": "constant.character.escape.java"
+						}
+					]
+				},
 				{
 					"begin": "\"",
 					"beginCaptures": {