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

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

Index: third_party/WebKit/Source/platform/v8_inspector/js_protocol.json
diff --git a/third_party/WebKit/Source/platform/v8_inspector/js_protocol.json b/third_party/WebKit/Source/platform/v8_inspector/js_protocol.json
index 43a5de8aeef22ec968d853201077cc4f9f38ef82..5b2303edfaaa4f8c386a2cfca2f7d252754bc09d 100644
--- a/third_party/WebKit/Source/platform/v8_inspector/js_protocol.json
+++ b/third_party/WebKit/Source/platform/v8_inspector/js_protocol.json
@@ -780,7 +780,7 @@
                     { "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

                 ]