DevTools: introduce Storage.clearDataForOrigin protocol command.

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 5104 matching lines @@
                 "parameters": [
                     { "name": "nodeId", "$ref": "DOM.NodeId", "description": "ID of node to get accessibility node for." }
                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$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
             }
         ]
+    },
+    {
+        "domain": "Storage",
+        "hidden": true,
+        "types": [
+            {
+                "id": "StorageType",
+                "type": "string",
+                "enum": [
+                    "appcache",
+                    "cookies",
+                    "file_systems",
+                    "indexeddb",
+                    "local_storage",
+                    "shader_cache",
+                    "websql",
+                    "webrtc_indetity",
+                    "service_workers",
+                    "cache_storage",
+                    "all"
+                ],
+                "description": "Enum of possible storage types."
+            }
+        ],
+        "commands": [
+            {
+                "name": "clearDataForOrigin",
+                "parameters": [
+                    { "name": "origin", "type": "string", "description": "Security origin." },
+                    { "name": "storageTypes", "type": "string", "description": "Comma separated origin names." }
+                ],
+                "description": "Clears storage for origin.",
+                "handlers": ["browser"]
+            }
+        ]
     }]
 }