Support 'Conditional' idl attribute.

client/dom/generated/src/frog/InspectorFrontendHost.dart

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-class _InspectorFrontendHostJs extends _DOMTypeJs implements InspectorFrontendHost native "*InspectorFrontendHost" {
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-  void bringToFront() native;
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-  bool canSaveAs() native;
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-  void closeWindow() native;
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-  void copyText(String text) native;
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-  String hiddenPanels() native;
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-  void inspectedURLChanged(String newURL) native;
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-  String loadResourceSynchronously(String url) native;
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-  void loaded() native;
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-  String localizedStringsURL() native;
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-  void moveWindowBy(num x, num y) native;
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-  void openInNewTab(String url) native;
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-  String platform() native;
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-  String port() native;
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-  void recordActionTaken(int actionCode) native;
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-  void recordPanelShown(int panelCode) native;
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-  void recordSettingChanged(int settingChanged) native;
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-  void requestAttachWindow() native;
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-  void requestDetachWindow() native;
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-  void requestSetDockSide(String side) native;
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-  void saveAs(String fileName, String content) native;
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-  void sendMessageToBackend(String message) native;
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-  void setAttachedWindowHeight(int height) native;
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-  void setInjectedScriptForOrigin(String origin, String script) native;
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-  void showContextMenu(_MouseEventJs event, Object items) native;
-}