[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 123 matching lines @@
     StepNext = 1,  // Step to the next statement in the current function.
     StepIn = 2,    // Step into new functions invoked or the next statement
                    // in the current function.
     StepFrame = 3  // Step into a new frame or return to previous frame.
   };
 
   static void PrepareStep(Isolate* isolate, StepAction action);
   static void ClearStepping(Isolate* isolate);
 
   /**
+   * Defines location inside script.
+   * Lines and columns are 0-based.
+   */
+  class Location {
+   public:
+    Location(int lineNumber, int columnNumber);
+    /**
+     * Create empty location.
+     */
+    Location();
+
+    int GetLineNumber() const;
+    int GetColumnNumber() const;
+    bool IsEmpty() const;
+
+   private:
+    int lineNumber_;
+    int columnNumber_;
+  };
+
+  /**
    * Native wrapper around v8::internal::Script object.
    */
   class Script {
    public:
     v8::Isolate* GetIsolate() const;
 
     ScriptOriginOptions OriginOptions() const;
     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;
+    bool GetPossibleBreakpoints(const Location& start, const Location& end,
+                                std::vector<Location>* locations) 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(const Location& location) const;
   };
 
   /**
    * Return array of compiled scripts.
    */
   static void GetLoadedScripts(Isolate* isolate,
                                PersistentValueVector<Script>& scripts);
 };
 
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_INTERFACE_H_