DevTooos: Profiler domain refactoring: Make deoptReason and positionTicks fields optional.

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 40f7ed63f20b6b699ee80f53c6603b0a8f8aab12..655fe49e8eec8e4d2966b6c83bd1ca8594c69510 100644
--- a/third_party/WebKit/Source/platform/v8_inspector/js_protocol.json
+++ b/third_party/WebKit/Source/platform/v8_inspector/js_protocol.json
@@ -781,8 +781,8 @@
                     { "name": "callFrame", "$ref": "Runtime.CallFrame", "description": "Function location." },
                     { "name": "hitCount", "type": "integer", "description": "Number of samples where this node was on top of the call stack." },
                     { "name": "children", "type": "array", "items": { "type": "integer" }, "optional": true, "description": "Child node ids." },
-                    { "name": "deoptReason", "type": "string", "experimental": true, "description": "The reason of being not optimized. The function may be deoptimized or marked as don't optimize."},
-                    { "name": "positionTicks", "type": "array", "items": { "$ref": "PositionTickInfo" }, "experimental": true, "description": "An array of source position ticks." }
+                    { "name": "deoptReason", "type": "string", "optional": true, "description": "The reason of being not optimized. The function may be deoptimized or marked as don't optimize."},
+                    { "name": "positionTicks", "type": "array", "items": { "$ref": "PositionTickInfo" }, "optional": true, "experimental": true, "description": "An array of source position ticks." }
                 ]
             },
             {