[DevTools] Add power profiler and power overview in timeline panel.

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 4044 matching lines @@
             {
                 "name": "dataCollected",
                 "parameters": [
                     { "name": "value", "type": "array", "items": { "type": "object" } }
                 ]
             },
             {
                 "name": "tracingComplete"
             }
         ]
+    },
+    {
+        "domain": "Power",

[pfeldman, 2014/01/09 11:38:52]

Oh, ok, so we have this new domain. I think it should be a part of the timeline
though.

+        "hidden": true,
+        "types": [
+            {
+                "id": "PowerEvent",
+                "type": "object",
+                "properties": [
+                    { "name": "type", "type": "string", "description": "Power Event Type." },
+                    { "name": "timestamp", "type": "number", "description": "Power Event Time." },
+                    { "name": "value", "type": "number", "description": "Power Event Value." }
+                ],
+                "description": "PowerEvent item"
+            }
+        ],
+        "commands": [],
+        "events": [
+            {
+                "name": "PowerEventsReceived",
+                "parameters": [
+                    {"name": "powerEvents", "type": "array", "items": { "$ref": "PowerEvent" }, "description": "List of power events." }
+                ]
+            },
+            {
+                "name": "powerProfileSupported",
+                "parameters": [
+                    { "name": "isSupported", "type": "boolean" }
+                ]
+            }
+        ]
     }]
 }