[inspector] added Debugger.getPossibleBreakpoints method

src/debug/debug-interface.h

Index: src/debug/debug-interface.h
diff --git a/src/debug/debug-interface.h b/src/debug/debug-interface.h
index 77bab3a50c6336a780394fd068c9febfcad6af83..69b2a2460940359009f37906c235969290030a39 100644
--- a/src/debug/debug-interface.h
+++ b/src/debug/debug-interface.h
@@ -158,6 +158,12 @@ class DebugInterface {
     MaybeLocal<String> SourceMappingURL() const;
     MaybeLocal<String> ContextData() const;
     MaybeLocal<String> Source() const;
+    /**
+     * lines and columns are 0-based.
+     */
+    bool GetPossibleBreakpoints(int start_line, int start_column, int end_line,
+                                int end_column,
+                                std::vector<int>& positions) const;
 
     /**
      * script parameter is a wrapper v8::internal::JSObject for
@@ -169,6 +175,9 @@ class DebugInterface {
      */
     static MaybeLocal<Script> Wrap(Isolate* isolate,
                                    v8::Local<v8::Object> script);
+
+   private:
+    int GetSourcePosition(int line, int column) const;
   };
 
   /**