[inspector] added Debugger.getPossibleBreakpoints method

src/debug/debug-interface.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DEBUG_DEBUG_INTERFACE_H_
 #define V8_DEBUG_DEBUG_INTERFACE_H_
 
 #include "include/v8-debug.h"
 #include "include/v8-util.h"
 #include "include/v8.h"
@@ skipping 140 matching lines @@
     bool WasCompiled() const;
     int Id() const;
     int LineOffset() const;
     int ColumnOffset() const;
     std::vector<int> LineEnds() const;
     MaybeLocal<String> Name() const;
     MaybeLocal<String> SourceURL() const;
     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
      * v8::internal::Script.
      * This function gets v8::internal::Script from v8::internal::JSObject and
      * wraps it with DebugInterface::Script.
      * Returns empty local if not called with a valid wrapper of
      * v8::internal::Script.
      */
     static MaybeLocal<Script> Wrap(Isolate* isolate,
                                    v8::Local<v8::Object> script);
+
+   private:
+    int GetSourcePosition(int line, int column) const;
   };
 
   /**
    * Return array of compiled scripts.
    */
   static void GetLoadedScripts(Isolate* isolate,
                                PersistentValueVector<Script>& scripts);
 };
 
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_INTERFACE_H_