[inspector] added Debugger.moduleRequested notification

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 699 matching lines @@
                     { "name": "executionContextId", "$ref": "Runtime.ExecutionContextId", "description": "Specifies script creation context." },
                     { "name": "hash", "type": "string", "description": "Content hash of the script."},
                     { "name": "executionContextAuxData", "type": "object", "optional": true, "description": "Embedder-specific auxiliary data." },
                     { "name": "sourceMapURL", "type": "string", "optional": true, "description": "URL of source map associated with script (if any)." },
                     { "name": "hasSourceURL", "type": "boolean", "optional": true, "description": "True, if this script has sourceURL.", "experimental": true },
                     { "name": "isModule", "type": "boolean", "optional": true, "description": "True, if this script is ES6 module.", "experimental": true }
                 ],
                 "description": "Fired when virtual machine fails to parse the script."
             },
             {
+                "name": "moduleRequested",
+                "parameters": [
+                    { "name": "refererId", "$ref": "Runtime.ScriptId", "description": "scriptIf of referer module." },
+                    { "name": "requestedId", "$ref": "Runtime.ScriptId", "description": "scriptId of requested module." },
+                    { "name": "specifier", "type": "string", "description": "Specifier passed to import statement."}
+                ],
+                "description": "Fired when one module requests another by specifier during instantiation."
+            },
+            {
                 "name": "breakpointResolved",
                 "parameters": [
                     { "name": "breakpointId", "$ref": "BreakpointId", "description": "Breakpoint unique identifier." },
                     { "name": "location", "$ref": "Location", "description": "Actual breakpoint location." }
                 ],
                 "description": "Fired when breakpoint is resolved to an actual script and location."
             },
             {
                 "name": "paused",
                 "parameters": [
@@ skipping 265 matching lines @@
             {
                 "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."}
                 ]
             }
         ]
     }]
 }