[inspector] introduced Debugger.scheduleStepIntoAsync

src/inspector/js_protocol.json

 {
     "version": { "major": "1", "minor": "2" },
     "domains": [
     {
         "domain": "Schema",
         "description": "Provides information about the protocol schema.",
         "types": [
             {
                 "id": "Domain",
                 "type": "object",
@@ skipping 549 matching lines @@
             },
             {
                 "name": "stepOut",
                 "description": "Steps out of the function call."
             },
             {
                 "name": "pause",
                 "description": "Stops on the next JavaScript statement."
             },
             {
+                "name": "scheduleStepIntoAsync",
+                "description": "Steps into next scheduled async task if any is scheduled before next pause. Returns success when async task is actually scheduled, returns error if no task were scheduled or another scheduleStepIntoAsync was called.",
+                "experimental": true
+            },
+            {
                 "name": "resume",
                 "description": "Resumes JavaScript execution."
             },
             {
                 "name": "searchInContent",
                 "parameters": [
                     { "name": "scriptId", "$ref": "Runtime.ScriptId", "description": "Id of the script to search in." },
                     { "name": "query", "type": "string", "description": "String to search for."  },
                     { "name": "caseSensitive", "type": "boolean", "optional": true, "description": "If true, search is case sensitive." },
                     { "name": "isRegex", "type": "boolean", "optional": true, "description": "If true, treats string parameter as regex." }
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             {
                 "name": "heapStatsUpdate",
                 "description": "If heap objects tracking has been started then backend may send update for one or more fragments",
                 "parameters": [
                     { "name": "statsUpdate", "type": "array", "items": { "type": "integer" }, "description": "An array of triplets. Each triplet describes a fragment. The first integer is the fragment index, the second integer is a total count of objects for the fragment, the third integer is a total size of the objects for the fragment."}
                 ]
             }
         ]
     }]
 }