[inspector] Support multiple sessions per context group

test/inspector/sessions/create-session-expected.txt

Index: test/inspector/sessions/create-session-expected.txt
diff --git a/test/inspector/sessions/create-session-expected.txt b/test/inspector/sessions/create-session-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f8c31a47dd58f422acc3471bdcf88a44497b0f0a
--- /dev/null
+++ b/test/inspector/sessions/create-session-expected.txt
@@ -0,0 +1,132 @@
+Tests that creating multiple sessions works.
+Connecting session 1
+From session 1
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 1
+            name : 
+            origin : 
+        }
+    }
+}
+Connecting session 2
+From session 2
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 1
+            name : 
+            origin : 
+        }
+    }
+}
+Reconnecting session 2
+From session 2
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 1
+            name : 
+            origin : 
+        }
+    }
+}
+Reconnecting session 1
+From session 1
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 1
+            name : 
+            origin : 
+        }
+    }
+}
+Connecting session 3
+From session 3
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 1
+            name : 
+            origin : 
+        }
+    }
+}
+Destroying and creating context
+From session 3
+{
+    method : Runtime.executionContextDestroyed
+    params : {
+        executionContextId : <executionContextId>
+    }
+}
+id matching: true
+From session 1
+{
+    method : Runtime.executionContextDestroyed
+    params : {
+        executionContextId : <executionContextId>
+    }
+}
+id matching: true
+From session 2
+{
+    method : Runtime.executionContextDestroyed
+    params : {
+        executionContextId : <executionContextId>
+    }
+}
+id matching: true
+From session 3
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 2
+            name : 
+            origin : 
+        }
+    }
+}
+From session 1
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 2
+            name : 
+            origin : 
+        }
+    }
+}
+From session 2
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 2
+            name : 
+            origin : 
+        }
+    }
+}
+Disconnecting all sessions
+Connecting session 4
+From session 4
+{
+    method : Runtime.executionContextCreated
+    params : {
+        context : {
+            id : 2
+            name : 
+            origin : 
+        }
+    }
+}