Add 2 Extension APIs for handwriting: experimental.input.sendHandritingStroke and cancelHandWriting

chrome/common/extensions/api/extension_api.json

Index: chrome/common/extensions/api/extension_api.json
diff --git a/chrome/common/extensions/api/extension_api.json b/chrome/common/extensions/api/extension_api.json
index 9b7dd7ffc710dbc63815b9a15e972a3a66312fc4..bcccb729759db7ab1c8e17960b618567e603d50a 100644
--- a/chrome/common/extensions/api/extension_api.json
+++ b/chrome/common/extensions/api/extension_api.json
@@ -2418,6 +2418,36 @@
             "parameters": []
           }
         ]
+      },
+      {
+        "name": "sendHandwritingStroke",
+        "type": "function",
+        "description": "Send a handwriting event to Chrome.",
+        "parameters": [
+          {
+            "name": "stroke",
+            "type": "array",
+            "items": {
+              "type": "object",
+              "properties": {
+                "x": {"type": "number", "minimum": 0, "maximum": 1},
+                "y": {"type": "number", "minimum": 0, "maximum": 1}
+              }
+            }
+          }
+        ]
+      },
+      {
+        "name": "cancelHandwriting",
+        "type": "function",
+        "description": "Clear last N handwriting strokes.",
+        "parameters": [
+          {
+            "name": "n_strokes",
+            "optional": true,
+            "type": "integer"
+          }
+        ]
       }
     ],
     "events": []