[DevTools] Send heap snapshot to the frontend immediatly when it is ready

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 3586 matching lines @@
                     { "name": "chunk", "type": "string" }
                 ]
             },
             {
                 "name": "resetProfiles"
             },
             {
                 "name": "reportHeapSnapshotProgress",
                 "parameters": [
                     { "name": "done", "type": "integer" },
-                    { "name": "total", "type": "integer" }
+                    { "name": "total", "type": "integer" },
+                    { "name": "finished", "type": "boolean", "optional": true }
                 ]
             },
             {
                 "name": "lastSeenObjectId",
                 "description": "If heap objects tracking has been started then backend regulary sends a current value for last seen object id and corresponding timestamp. If the were changes in the heap since last event then one or more heapStatsUpdate events will be sent before a new lastSeenObjectId event.",
                 "parameters": [
                     { "name": "lastSeenObjectId", "type": "integer" },
                     { "name": "timestamp", "type": "number" }
                 ]
             },
@@ skipping 500 matching lines @@
                 ],
                 "handlers": ["browser", "frontend"]
             },
             {
                 "name": "tracingComplete",
                 "handlers": ["browser", "frontend"]
             }
         ]
     }]
 }