[inspector] added Debugger.moduleRequested notification

src/inspector/js_protocol.json

Index: src/inspector/js_protocol.json
diff --git a/src/inspector/js_protocol.json b/src/inspector/js_protocol.json
index aadd98aaa729580b6eee93f7f1f3e6edf3291836..541d1d8d2b9f6b23446b2b222f8a17789b817440 100644
--- a/src/inspector/js_protocol.json
+++ b/src/inspector/js_protocol.json
@@ -717,6 +717,15 @@
                 "description": "Fired when virtual machine fails to parse the script."
             },
             {
+                "name": "moduleResolved",
+                "parameters": [
+                    { "name": "refererId", "$ref": "Runtime.ScriptId", "description": "Id of module which request another." },
+                    { "name": "requestedId", "$ref": "Runtime.ScriptId", "description": "Id of another module." },
+                    { "name": "specifier", "type": "string", "description": "Specifier passed to import statement."}
+                ],
+                "description": "Fired when one module successfully import another."

[neis, 2017/02/01 13:38:55]

s/import/imports/

I find this description a little unclear. "Successfully" imported to me would
imply e.g. that all the variables that the importing module requests from the
imported module can be resolved, but you're calling the handler before that is
determined (in fact even before the imported module itself has been
instantiated).

[kozy, 2017/02/01 16:39:25]

I renamed this notification to moduleRequested. We mostly need it to implement
go to import, dependency graph and to help users with understanding of import
errors.
Could you suggest better instrumentation point to get enough information as
earlier as possible?

[neis, 2017/02/06 09:20:33]

If you want to get information as early as possible, this seems like a
reasonable place.

+            },
+            {
                 "name": "breakpointResolved",
                 "parameters": [
                     { "name": "breakpointId", "$ref": "BreakpointId", "description": "Breakpoint unique identifier." },