Update DevTools Tracing.Start to accept trace config as a parameter

third_party/WebKit/Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications.",
@@ skipping 4806 matching lines @@
                 ]
             },
             {
                 "name": "clearDeviceOrientationOverride",
                 "description": "Clears the overridden Device Orientation."
             }
         ]
     },
     {
         "domain": "Tracing",
+        "types": [
+            {
+                "id": "RecordMode",
+                "type": "string",
+                "enum": ["recordUntilFull", "recordContinuously", "recordAsMuchAsPossible", "echoToConsole"],
+                "description": ""

[caseq, 2016/03/05 02:25:24]

Here and below -- please add descriptions.

+            },
+            {
+                "id": "MemoryDumpTrigger",
+                "type": "object",
+                "properties": [
+                    { "name": "mode", "type": "string", "optional": false, "description": "" },
+                    { "name": "periodicIntervalMs", "type": "integer", "optional": false, "description": "" }
+                ]
+            },
+            {
+                "id": "MemoryDumpConfig",
+                "type": "object",
+                "properties": [
+                    { "name": "triggers", "type": "array", "items": { "$ref": "Tracing.MemoryDumpTrigger" }, "optional": false, "description": "" }
+                ]
+            },
+            {
+                "id": "TraceConfig",
+                "type": "object",
+                "properties": [
+                    { "name": "recordMode", "$ref": "Tracing.RecordMode", "optional": true, "description": "" },
+                    { "name": "enableSampling", "type": "boolean", "optional": true, "description": "" },
+                    { "name": "enableSystrace", "type": "boolean", "optional": true, "description": "" },
+                    { "name": "enableArgumentFilter", "type": "boolean", "optional": true, "description": "" },
+                    { "name": "includedCategories", "type": "array", "items": { "type": "string" }, "optional": true, "description": "" },
+                    { "name": "excludedCategories", "type": "array", "items": { "type": "string" }, "optional": true, "description": "" },
+                    { "name": "syntheticDelays", "type": "array", "items": { "type": "string" }, "optional": true, "description": "" },
+                    { "name": "memoryDumpConfig", "$ref": "Tracing.MemoryDumpConfig", "optional": true, "description": "" }
+                ]
+            }
+        ],
         "commands": [
             {
                 "name": "start",
                 "async": true,
                 "description": "Start trace events collection.",
                 "parameters": [
                     { "name": "categories", "type": "string", "optional": true, "description": "Category/tag filter" },

[caseq, 2016/03/05 02:25:24]

deprecated: true?

                     { "name": "options", "type": "string", "optional": true, "description": "Tracing options" },

[caseq, 2016/03/05 02:25:24]

ditto.

                     { "name": "bufferUsageReportingInterval", "type": "number", "optional": true, "description": "If set, the agent will issue bufferUsage events at this interval, specified in milliseconds" },
-                    { "name": "transferMode", "type": "string", "enum": ["ReportEvents", "ReturnAsStream"], "optional": true, "description": "Whether to report trace events as series of dataCollected events or to save trace to a stream (defaults to <code>ReportEvents</code>)." }
+                    { "name": "transferMode", "type": "string", "enum": ["ReportEvents", "ReturnAsStream"], "optional": true, "description": "Whether to report trace events as series of dataCollected events or to save trace to a stream (defaults to <code>ReportEvents</code>)." },
+                    { "name": "traceConfig", "$ref": "Tracing.TraceConfig", "optional": true, "description": "" }
                 ],
                 "handlers": ["browser", "renderer"]
             },
             {
                 "name": "end",
                 "async": true,
                 "description": "Stop trace events collection.",
                 "handlers": ["browser", "renderer"]
             },
             {
@@ skipping 337 matching lines @@
                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$ref": "AXNode", "description": "The <code>Accessibility.AXNode</code> for this DOM node, if it exists.", "optional": true }
                 ],
                 "description": "Fetches the accessibility node for this DOM node, if it exists.",
                 "hidden": true
             }
         ]
     }]
 }