Workaround for 14802

Source/bindings/v8/ScriptDebugServer.cpp

Index: Source/bindings/v8/ScriptDebugServer.cpp
diff --git a/Source/bindings/v8/ScriptDebugServer.cpp b/Source/bindings/v8/ScriptDebugServer.cpp
index 89c9ea7a7946971cbef658513ff0166ce496da6f..2eb227aafc0a6976f415c918ef59137c90ef4e03 100644
--- a/Source/bindings/v8/ScriptDebugServer.cpp
+++ b/Source/bindings/v8/ScriptDebugServer.cpp
@@ -393,6 +393,12 @@ void ScriptDebugServer::handleProgramBreak(v8::Handle<v8::Object> executionState
 
 void ScriptDebugServer::handleProgramBreak(const v8::Debug::EventDetails& eventDetails, v8::Handle<v8::Value> exception, v8::Handle<v8::Array> hitBreakpointNumbers)
 {
+    // FIXME(http://dartbug.com/14802): The check in the function above appears to be insufficient as
+    // m_pausedContext is cleared for current invocations of handleProgramBreak.
+    // Don't allow nested breaks.
+    if (isPaused())
+        return;
+
     m_pausedContext = eventDetails.GetEventContext();
     handleProgramBreak(eventDetails.GetExecutionState(), exception, hitBreakpointNumbers);
     m_pausedContext.Clear();