DevTools: Make children field of the CpuProfileNode optional in the protocol.

third_party/WebKit/Source/platform/v8_inspector/js_protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Runtime",
         "description": "Runtime domain exposes JavaScript runtime by means of remote evaluation and mirror objects. Evaluation results are returned as mirror object that expose object type, string representation and unique identifier that can be used for further object reference. Original objects are maintained in memory unless they are either explicitly released or are released along with the other objects in their object group.",
         "types": [
             {
                 "id": "ScriptId",
                 "type": "string",
                 "description": "Unique script identifier."
@@ skipping 762 matching lines @@
         "experimental": true,
         "types": [
             {
                 "id": "CPUProfileNode",
                 "type": "object",
                 "description": "CPU Profile node. Holds callsite information, execution statistics and child nodes.",
                 "properties": [
                     { "name": "id", "type": "integer", "description": "Unique id of the node." },
                     { "name": "callFrame", "$ref": "Runtime.CallFrame", "description": "Function location." },
                     { "name": "hitCount", "type": "integer", "description": "Number of samples where this node was on top of the call stack." },
-                    { "name": "children", "type": "array", "items": { "type": "integer" }, "description": "Child node ids." },
+                    { "name": "children", "type": "array", "items": { "type": "integer" }, "optional": true, "description": "Child node ids." },
                     { "name": "deoptReason", "type": "string", "experimental": true, "description": "The reason of being not optimized. The function may be deoptimized or marked as don't optimize."},

[dgozman, 2016/08/19 18:44:09]

This one should be optional as well.

[alph, 2016/08/19 22:58:34]

I plan to address this in a separate change.

                     { "name": "positionTicks", "type": "array", "items": { "$ref": "PositionTickInfo" }, "experimental": true, "description": "An array of source position ticks." }

[dgozman, 2016/08/19 18:44:09]

And this one maybe?

[alph, 2016/08/19 22:58:34]

ditto

                 ]
             },
             {
                 "id": "CPUProfile",
                 "type": "object",
                 "description": "Profile.",
                 "properties": [
                     { "name": "nodes", "type": "array", "items": { "$ref": "CPUProfileNode" }, "description": "The list of profile nodes. First item is the root node." },
                     { "name": "startTime", "type": "number", "description": "Profiling start time in seconds." },
                     { "name": "endTime", "type": "number", "description": "Profiling end time in seconds." },
@@ skipping 182 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."}
                 ]
             }
         ]
     }]
 }