Adding callbacks to `chrome.cookies.{set,remove}`.

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 b5f19e0b6c1744db3fe6781e257033d75de9997f..a8ef0e1d0c629f2ba49fe7aca2ccad457da97792 100644
--- a/chrome/common/extensions/api/extension_api.json
+++ b/chrome/common/extensions/api/extension_api.json
@@ -3186,6 +3186,16 @@
               "expirationDate": {"type": "number", "optional": true, "description": "The expiration date of the cookie as the number of seconds since the UNIX epoch. If omitted, the cookie becomes a session cookie."},
               "storeId": {"type": "string", "optional": true, "description": "The ID of the cookie store in which to set the cookie. By default, the cookie is set in the current execution context's cookie store."}
             }
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": [
+              {
+                "name": "cookie", "$ref": "Cookie", "optional": true, "description": "Contains details about the cookie that's been set.  If setting failed for any reason, this will be \"null\", and \"chrome.extension.lastError\" will be set."
+              }
+            ]
           }
         ]
       },
@@ -3203,6 +3213,24 @@
               "name": {"type": "string", "description": "The name of the cookie to remove."},
               "storeId": {"type": "string", "optional": true, "description": "The ID of the cookie store to look in for the cookie. If unspecified, the cookie is looked for by default in the current execution context's cookie store."}
             }
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "parameters": [
+              {
+                "name": "details",
+                "type": "object",
+                "description": "Contains details about the cookie that's been removed.  If removal failed for any reason, this will be \"null\", and \"chrome.extension.lastError\" will be set.",
+                "optional": true,
+                "properties": {
+                  "url": {"type": "string", "description": "The URL associated with the cookie that's been removed."},
+                  "name": {"type": "string", "description": "The name of the cookie that's been removed."},
+                  "storeId": {"type": "string", "description": "The ID of the cookie store from which the cookie was removed."}
+                }
+              }
+            ]
           }
         ]
       },