[Extensions] Enable promise support on the windows API

This CL changes over the json schema to use the new returns_async format
to define callbacks, enabling promise support on those APIs.

Bug: 328932
Change-Id: I524d814fd6c9839e9804e6de808bd62ebc2f8fb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515441Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Tim Judkins <tjudkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826843}

chrome/common/extensions/api/windows.json

@@ -120,9 +120,9 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
+          }
+        ],
+        "returns_async": {
           "name": "callback",
           "parameters": [
             {
@@ -130,7 +130,6 @@
             }
           ]
         }
-        ]
       },
       {
         "name": "getCurrent",
@@ -141,9 +140,9 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
+          }
+        ],
+        "returns_async": {
           "name": "callback",
           "parameters": [
             {
@@ -151,7 +150,6 @@
             }
           ]
         }
-        ]
       },
       {
         "name": "getLastFocused",
@@ -162,9 +160,9 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
+          }
+        ],
+        "returns_async": {
           "name": "callback",
           "parameters": [
             {
@@ -172,7 +170,6 @@
             }
           ]
         }
-        ]
       },
       {
         "name": "getAll",
@@ -183,9 +180,9 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
+          }
+        ],
+        "returns_async": {
           "name": "callback",
           "parameters": [
             {
@@ -193,7 +190,6 @@
             }
           ]
         }
-        ]
       },
       {
         "name": "create",
@@ -236,9 +232,9 @@
               }
             },
             "optional": true
-          },
-          {
-            "type": "function",
+          }
+        ],
+        "returns_async": {
           "name": "callback",
           "optional": true,
           "parameters": [
@@ -248,7 +244,6 @@
             }
           ]
         }
-        ]
       },
       {
         "name": "update",
@@ -272,9 +267,9 @@
                 "description": "The new state of the window. The 'minimized', 'maximized', and 'fullscreen' states cannot be combined with 'left', 'top', 'width', or 'height'."
               }
             }
-          },
-          {
-            "type": "function",
+          }
+        ],
+        "returns_async": {
           "name": "callback",
           "optional": true,
           "parameters": [
@@ -283,16 +278,15 @@
             }
           ]
         }
-        ]
       },
       {
         "name": "remove",
         "type": "function",
         "description": "Removes (closes) a window and all the tabs inside it.",
         "parameters": [
-          {"type": "integer", "name": "windowId", "minimum": 0},
-          {"type": "function", "name": "callback", "optional": true, "parameters": []}
-        ]
+          {"type": "integer", "name": "windowId", "minimum": 0}
+        ],
+        "returns_async": {"name": "callback", "optional": true, "parameters": []}
       }
     ],
     "events": [