[WIP] Protocol for sending information about Promises to frontend.

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
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                     { "name": "compileError", "optional": true, "type": "object", "properties":
                         [
                             { "name": "message", "type": "string", "description": "Compiler error message" },
                             { "name": "lineNumber", "type": "integer", "description": "Compile error line number (1-based)" },
                             { "name": "columnNumber", "type": "integer", "description": "Compile error column number (1-based)" }
                         ]
                     }
                 ],
                 "description": "Error data for setScriptSource command. compileError is a case type for uncompilable script source error.",
                 "hidden": true
+            },
+            {
+                "id": "PromiseDetails",
+                "type": "object",
+                "description": "Information about the promise.",
+                "properties": [
+                    { "name": "id", "type": "integer", "description": "Unique id of the promise." },
+                    { "name": "status", "type": "string", "enum": ["pending", "resolved", "rejected"], "description": "Status of the promise." },
+                    { "name": "parentId", "type": "integer", "optional": true, "description": "Id of the parent promise." },
+                    { "name": "callFrame", "$ref": "Console.CallFrame", "optional": true, "description": "Top call frame on promise creation."}
+                ],
+                "hidden": true
             }
         ],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables debugger for the given page. Clients should not assume that the debugging has been enabled until the result for this command is received."
             },
             {
                 "name": "disable",
                 "description": "Disables debugger for given page."
@@ skipping 262 matching lines @@
                 "hidden": true,
                 "description": "Makes backend skip steps in the sources with names matching given pattern. VM will try leave blacklisted scripts by performing 'step in' several times, finally resorting to 'step out' if unsuccessful."
             },
             {
                 "name": "setAsyncCallStackDepth",
                 "parameters": [
                     { "name": "maxDepth", "type": "integer", "description": "Maximum depth of async call stacks. Setting to <code>0</code> will effectively disable collecting async call stacks (default)." }
                 ],
                 "hidden": true,
                 "description": "Enables or disables async call stacks tracking."
+            },
+            {
+                "name": "enablePromiseTracker",
+                "hidden": true,
+                "description": "Enables promise tracking, information about <code>Promise</code>s created or updated will now be stored on the backend."
+            },
+            {
+                "name": "disablePromiseTracker",
+                "hidden": true,
+                "description": "Disables promise tracking."
+            },
+            {
+                "name": "getPromises",
+                "returns": [
+                    { "name": "promises", "type": "array", "items": { "$ref": "PromiseDetails" }, "description": "Information about stored promises." }
+                ],
+                "hidden": true,
+                "description": "Returns detailed information about all <code>Promise</code>s that were created or updated after the <code>enablePromiseTracker</code> command, and have not been garbage collected yet."
             }
         ],
         "events": [
             {
                 "name": "globalObjectCleared",
                 "description": "Called when global has been cleared and debugger client should reset its state. Happens upon navigation or reload."
             },
             {
                 "name": "scriptParsed",
                 "parameters": [
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             {
                 "name": "dataAvailable",
                 "parameters": [
                     {"name": "value", "type": "array", "items": { "$ref": "PowerEvent" }, "description": "List of power events." }
                 ],
                 "handlers": ["browser", "frontend"]
             }
         ]
     }]
 }