Model each Dart library as its own ScriptState when devtools are enabled.

Source/core/inspector/PageRuntimeAgent.cpp

Index: Source/core/inspector/PageRuntimeAgent.cpp
diff --git a/Source/core/inspector/PageRuntimeAgent.cpp b/Source/core/inspector/PageRuntimeAgent.cpp
index c6e81e5e446df4a218d40de6f29b1fc639d78474..23a69c2262ed1000f81f5efc233c3158242aed6d 100644
--- a/Source/core/inspector/PageRuntimeAgent.cpp
+++ b/Source/core/inspector/PageRuntimeAgent.cpp
@@ -31,6 +31,7 @@
 #include "config.h"
 #include "core/inspector/PageRuntimeAgent.h"
 
+#include "bindings/dart/DartController.h"
 #include "bindings/v8/DOMWrapperWorld.h"
 #include "bindings/v8/ScriptController.h"
 #include "core/inspector/InjectedScript.h"
@@ -168,6 +169,8 @@ void PageRuntimeAgent::reportExecutionContextCreation()
 
         ScriptState* scriptState = mainWorldScriptState(frame);
         notifyContextCreated(frameId, scriptState, 0, true);
+        notifyDartContextCreated(frameId, scriptState);
+
         frame->script()->collectIsolatedContexts(isolatedContexts);
         if (isolatedContexts.isEmpty())
             continue;
@@ -177,11 +180,27 @@ void PageRuntimeAgent::reportExecutionContextCreation()
     }
 }
 
+void PageRuntimeAgent::notifyDartContextCreated(const String& frameId, ScriptState* v8ScriptState)
+{
+    ScriptExecutionContext* scriptExecutionContext = v8ScriptState->scriptExecutionContext();
+    DartController* dartController = DartController::retrieve(scriptExecutionContext);
+    if (dartController) {
+        Vector<ScriptState*> scriptStates;
+        dartController->collectScriptStates(v8ScriptState, scriptStates);
+        for (size_t i = 0; i< scriptStates.size(); i++)
+            notifyContextCreated(frameId, scriptStates[i], 0, false);
+    }
+}
+
 void PageRuntimeAgent::notifyContextCreated(const String& frameId, ScriptState* scriptState, SecurityOrigin* securityOrigin, bool isPageContext)
 {
-    ASSERT(securityOrigin || isPageContext);
+    // FIXME(dartbug.com/13801): remove the check for
+    // !scriptState->isJavaScript() once Dart scripts have correct security
+    // origins.
+    ASSERT(securityOrigin || isPageContext || !scriptState->isJavaScript());
     int executionContextId = injectedScriptManager()->injectedScriptIdFor(scriptState);
-    String name = securityOrigin ? securityOrigin->toRawString() : "";
+    String name = scriptState->name() ? *scriptState->name() : (securityOrigin ? securityOrigin->toRawString() : "");
+
     m_frontend->executionContextCreated(ExecutionContextDescription::create()
         .setId(executionContextId)
         .setIsPageContext(isPageContext)