[DevTools] Support multiple sessions in Target domain

third_party/WebKit/Source/core/inspector/browser_protocol.json

Index: third_party/WebKit/Source/core/inspector/browser_protocol.json
diff --git a/third_party/WebKit/Source/core/inspector/browser_protocol.json b/third_party/WebKit/Source/core/inspector/browser_protocol.json
index d2c1c88d14cee432d31abfeaea01437e4843fdac..e7546b6fd3b5abe4c724e2744369b9f8be8a3f8a 100644
--- a/third_party/WebKit/Source/core/inspector/browser_protocol.json
+++ b/third_party/WebKit/Source/core/inspector/browser_protocol.json
@@ -3551,6 +3551,10 @@
                 "id": "TargetID",
                 "type": "string"
             },
+            {
+                "id": "SessionID",
+                "type": "string"
+            },
             {
                 "id": "BrowserContextID",
                 "type": "string"
@@ -3605,9 +3609,9 @@
             },
             {
                 "name": "sendMessageToTarget",
-                "description": "Sends protocol message to the target with given id.",
+                "description": "Sends protocol message to the session with given id.",
                 "parameters": [
-                    { "name": "targetId", "$ref": "TargetID" },
+                    { "name": "sessionId", "$ref": "SessionID" },
                     { "name": "message", "type": "string" }
                 ]
             },
@@ -3645,14 +3649,14 @@
                     { "name": "targetId", "$ref": "TargetID" }
                 ],
                 "returns": [
-                    { "name": "success", "type": "boolean", "description": "Whether attach succeeded." }
+                    { "name": "sessionId", "$ref": "SessionID", "optional": true, "description": "Id assigned to the session, only present if attached successfully." }
                 ]
             },
             {
                 "name": "detachFromTarget",
-                "description": "Detaches from the target with given id.",
+                "description": "Detaches from the session with given id.",
                 "parameters": [
-                    { "name": "targetId", "$ref": "TargetID" }
+                    { "name": "sessionId", "$ref": "TargetID" }

[caseq, 2017/06/27 18:29:30]

s/TargetID/SessionID/

                 ]
             },
             {
@@ -3712,22 +3716,23 @@
                 "name": "attachedToTarget",
                 "description": "Issued when attached to target because of auto-attach or <code>attachToTarget</code> command.",
                 "parameters": [
+                    { "name": "sessionId", "$ref": "SessionID", "description": "Id assigned to the session for future communication." },
                     { "name": "targetInfo", "$ref": "TargetInfo" },
                     { "name": "waitingForDebugger", "type": "boolean" }
                 ]
             },
             {
                 "name": "detachedFromTarget",
-                "description": "Issued when detached from target for any reason (including <code>detachFromTarget</code> command).",
+                "description": "Issued when detached from session for any reason (including <code>detachFromTarget</code> command).",
                 "parameters": [
-                    { "name": "targetId", "$ref": "TargetID" }
+                    { "name": "sessionId", "$ref": "SessionID" }
                 ]
             },
             {
                 "name": "receivedMessageFromTarget",
-                "description": "Notifies about new protocol message from attached target.",
+                "description": "Notifies about a new protocol message from the session (as reported in <code>attachedToTarget</code> event).",
                 "parameters": [
-                    { "name": "targetId", "$ref": "TargetID" },
+                    { "name": "sessionId", "$ref": "SessionID" },
                     { "name": "message", "type": "string" }
                 ]
             }