Merge 93042 - Web Inspector: [V8] crash upon stepIn while not on pause.

Source/WebCore/inspector/InspectorDebuggerAgent.cpp

Index: Source/WebCore/inspector/InspectorDebuggerAgent.cpp
===================================================================
--- Source/WebCore/inspector/InspectorDebuggerAgent.cpp	(revision 93524)
+++ Source/WebCore/inspector/InspectorDebuggerAgent.cpp	(working copy)
@@ -350,24 +350,32 @@
     m_javaScriptPauseScheduled = true;
 }
 
-void InspectorDebuggerAgent::resume(ErrorString*)
+void InspectorDebuggerAgent::resume(ErrorString* errorString)
 {
+    if (!assertPaused(errorString))
+        return;
     m_injectedScriptManager->releaseObjectGroup(InspectorDebuggerAgent::backtraceObjectGroup);
     scriptDebugServer().continueProgram();
 }
 
-void InspectorDebuggerAgent::stepOver(ErrorString*)
+void InspectorDebuggerAgent::stepOver(ErrorString* errorString)
 {
+    if (!assertPaused(errorString))
+        return;
     scriptDebugServer().stepOverStatement();
 }
 
-void InspectorDebuggerAgent::stepInto(ErrorString*)
+void InspectorDebuggerAgent::stepInto(ErrorString* errorString)
 {
+    if (!assertPaused(errorString))
+        return;
     scriptDebugServer().stepIntoStatement();
 }
 
-void InspectorDebuggerAgent::stepOut(ErrorString*)
+void InspectorDebuggerAgent::stepOut(ErrorString* errorString)
 {
+    if (!assertPaused(errorString))
+        return;
     scriptDebugServer().stepOutOfFunction();
 }
 
@@ -499,6 +507,15 @@
     m_javaScriptPauseScheduled = false;
 }
 
+bool InspectorDebuggerAgent::assertPaused(ErrorString* errorString)
+{
+    if (!m_pausedScriptState) {
+        *errorString = "Can only perform operation while paused.";
+        return false;
+    }
+    return true;
+}
+
 } // namespace WebCore
 
 #endif // ENABLE(JAVASCRIPT_DEBUGGER) && ENABLE(INSPECTOR)