[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

@@ -120,17 +120,16 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
-            "name": "callback",
-            "parameters": [
-              {
-                "name": "window", "$ref": "Window"
-              }
-            ]
           }
-        ]
+        ],
+        "returns_async": {
+          "name": "callback",
+          "parameters": [
+            {
+              "name": "window", "$ref": "Window"
+            }
+          ]
+        }
       },
       {
         "name": "getCurrent",
@@ -141,17 +140,16 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
-            "name": "callback",
-            "parameters": [
-              {
-                "name": "window", "$ref": "Window"
-              }
-            ]
           }
-        ]
+        ],
+        "returns_async": {
+          "name": "callback",
+          "parameters": [
+            {
+              "name": "window", "$ref": "Window"
+            }
+          ]
+        }
       },
       {
         "name": "getLastFocused",
@@ -162,17 +160,16 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
-            "name": "callback",
-            "parameters": [
-              {
-                "name": "window", "$ref": "Window"
-              }
-            ]
           }
-        ]
+        ],
+        "returns_async": {
+          "name": "callback",
+          "parameters": [
+            {
+              "name": "window", "$ref": "Window"
+            }
+          ]
+        }
       },
       {
         "name": "getAll",
@@ -183,17 +180,16 @@
             "name": "queryOptions",
             "$ref": "QueryOptions",
             "optional": true
-          },
-          {
-            "type": "function",
-            "name": "callback",
-            "parameters": [
-              {
-                "name": "windows", "type": "array", "items": { "$ref": "Window" }
-              }
-            ]
           }
-        ]
+        ],
+        "returns_async": {
+          "name": "callback",
+          "parameters": [
+            {
+              "name": "windows", "type": "array", "items": { "$ref": "Window" }
+            }
+          ]
+        }
       },
       {
         "name": "create",
@@ -236,19 +232,18 @@
               }
             },
             "optional": true
-          },
-          {
-            "type": "function",
-            "name": "callback",
-            "optional": true,
-            "parameters": [
-              {
-                "name": "window", "$ref": "Window", "description": "Contains details about the created window.",
-                "optional": true
-              }
-            ]
           }
-        ]
+        ],
+        "returns_async": {
+          "name": "callback",
+          "optional": true,
+          "parameters": [
+            {
+              "name": "window", "$ref": "Window", "description": "Contains details about the created window.",
+              "optional": true
+            }
+          ]
+        }
       },
       {
         "name": "update",
@@ -272,27 +267,26 @@
                 "description": "The new state of the window. The 'minimized', 'maximized', and 'fullscreen' states cannot be combined with 'left', 'top', 'width', or 'height'."
               }
             }
-          },
-          {
-            "type": "function",
-            "name": "callback",
-            "optional": true,
-            "parameters": [
-              {
-                "name": "window", "$ref": "Window"
-              }
-            ]
           }
-        ]
+        ],
+        "returns_async": {
+          "name": "callback",
+          "optional": true,
+          "parameters": [
+            {
+              "name": "window", "$ref": "Window"
+            }
+          ]
+        }
       },
       {
         "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": [