[inspector] added type of break location into getPossibleBreakpoints output

src/inspector/js_protocol.json

 {
     "version": { "major": "1", "minor": "2" },
     "domains": [
     {
         "domain": "Schema",
         "description": "Provides information about the protocol schema.",
         "types": [
             {
                 "id": "Domain",
                 "type": "object",
@@ skipping 453 matching lines @@
             },
             {
                 "id": "SearchMatch",
                 "type": "object",
                 "description": "Search match for resource.",
                 "properties": [
                     { "name": "lineNumber", "type": "number", "description": "Line number in resource content." },
                     { "name": "lineContent", "type": "string", "description": "Line with match content." }
                 ],
                 "experimental": true
+            },
+            {
+                "id": "BreakLocation",
+                "type": "object",
+                "properties": [
+                    { "name": "location", "$ref": "Location", "description": "Possible break location." },
+                    { "name": "type", "type": "string", "enum": [ "debuggerStatement", "call", "return" ], "optional": true }
+                ],
+                "experimental": true
             }
         ],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables debugger for the given page. Clients should not assume that the debugging has been enabled until the result for this command is received."
             },
             {
                 "name": "disable",
                 "description": "Disables debugger for given page."
@@ skipping 47 matching lines @@
                 "description": "Removes JavaScript breakpoint."
             },
             {
                 "name": "getPossibleBreakpoints",
                 "parameters": [
                     { "name": "start", "$ref": "Location", "description": "Start of range to search possible breakpoint locations in." },
                     { "name": "end", "$ref": "Location", "optional": true, "description": "End of range to search possible breakpoint locations in (excluding). When not specifed, end of scripts is used as end of range." },
                     { "name": "restrictToFunction", "type": "boolean", "optional": true, "description": "Only consider locations which are in the same (non-nested) function as start." }
                 ],
                 "returns": [
-                    { "name": "locations", "type": "array", "items": { "$ref": "Location" }, "description": "List of the possible breakpoint locations." }
+                    { "name": "locations", "type": "array", "items": { "$ref": "BreakLocation" }, "description": "List of the possible breakpoint locations." }
                 ],
                 "description": "Returns possible locations for breakpoint. scriptId in start and end range locations should be the same.",
                 "experimental": true
             },
             {
                 "name": "continueToLocation",
                 "parameters": [
                     { "name": "location", "$ref": "Location", "description": "Location to continue to." }
                 ],
                 "description": "Continues execution until specific location is reached."
@@ skipping 503 matching lines @@
             {
                 "name": "heapStatsUpdate",
                 "description": "If heap objects tracking has been started then backend may send update for one or more fragments",
                 "parameters": [
                     { "name": "statsUpdate", "type": "array", "items": { "type": "integer" }, "description": "An array of triplets. Each triplet describes a fragment. The first integer is the fragment index, the second integer is a total count of objects for the fragment, the third integer is a total size of the objects for the fragment."}
                 ]
             }
         ]
     }]
 }