Allow configuring CPU profiler sampling interval

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "0" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
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             }
         ],
         "commands": [
             {
                 "name": "enable"
             },
             {
                 "name": "disable"
             },
             {
+                "name": "setSamplingInterval",
+                "parameters": [
+                    { "name": "interval", "type": "integer", "description": "New sampling interval in microseconds." }
+                ],
+                "description": "Changes CPU profiler sampling interval. Must be called before CPU profiles recording started."
+            },
+            {
                 "name": "start"
             },
             {
                 "name": "stop",
                 "returns": [
                     { "name": "header", "$ref": "ProfileHeader", "description": "The header of the recorded profile."}
                 ]
             },
             {
                 "name": "getProfileHeaders",
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                 "parameters": [
                     { "name": "value", "type": "array", "items": { "type": "object" } }
                 ]
             },
             {
                 "name": "tracingComplete"
             }
         ]
     }]
 }