[inspector] Return error when paused in different context group

test/inspector/debugger/pause.js

 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 InspectorTest.log('Checks Debugger.pause');
 let contextGroup1 = new InspectorTest.ContextGroup();
 let session1 = contextGroup1.connect();
 let Protocol1 = session1.Protocol;
 
 session1.setupScriptMap();
@@ skipping 64 matching lines @@
     await Protocol1.Debugger.resume();
 
     contextGroup1.schedulePauseOnNextStatement('', '');
     contextGroup1.cancelPauseOnNextStatement();
     await Protocol1.Debugger.pause();
     Protocol1.Runtime.evaluate({expression: 'var a = 42;'});
     await waitPauseAndDumpLocation(session1);
     await Protocol1.Debugger.resume();
   },
 
+  async function testResumeAnotherGroup() {
+    let contextGroup2 = new InspectorTest.ContextGroup();
+    let session2 = contextGroup2.connect();
+    session2.setupScriptMap();
+    let Protocol2 = session2.Protocol;
+    Protocol2.Debugger.enable();
+    Protocol1.Debugger.pause();
+    Protocol1.Runtime.evaluate({expression: 'var a = 42;'});
+    await waitPauseAndDumpLocation(session1);
+    InspectorTest.logMessage(await Protocol2.Debugger.resume());
+    InspectorTest.logMessage(await Protocol2.Debugger.stepOver());
+    InspectorTest.logMessage(await Protocol2.Debugger.stepInto());
+    InspectorTest.logMessage(await Protocol2.Debugger.stepOut());
+    await Protocol1.Debugger.resume();
+    await Protocol2.Debugger.disable();
+  },
+
   async function testDisableBreaksShouldCancelPause() {
     await Protocol1.Debugger.pause();
     await Protocol1.Debugger.setBreakpointsActive({active: false});
     Protocol1.Runtime.evaluate({expression: 'var a = 42;'})
       .then(() => Protocol1.Debugger.setBreakpointsActive({active: true}))
       .then(() => Protocol1.Runtime.evaluate({expression: 'debugger'}));
     await waitPauseAndDumpLocation(session1);
     await Protocol1.Debugger.resume();
   }
 ]);
 
 async function waitPauseAndDumpLocation(session) {
   var message = await session.Protocol.Debugger.oncePaused();
   InspectorTest.log('paused at:');
   await session.logSourceLocation(message.params.callFrames[0].location);
   return message;
 }