[inspector] restore provisional breakpoints smarter

src/inspector/v8-debugger-script.h

Index: src/inspector/v8-debugger-script.h
diff --git a/src/inspector/v8-debugger-script.h b/src/inspector/v8-debugger-script.h
index bb869899f25120d13a8d5351348740a0ed825701..cd6fc329fbd887c09f028f75f247ce79cdfc56e3 100644
--- a/src/inspector/v8-debugger-script.h
+++ b/src/inspector/v8-debugger-script.h
@@ -59,8 +59,8 @@ class V8DebuggerScript {
   bool hasSourceURL() const { return !m_sourceURL.isEmpty(); }
   const String16& sourceURL() const;
   virtual const String16& sourceMappingURL() const = 0;
-  virtual String16 source(v8::Isolate*) const { return m_source; }
-  const String16& hash(v8::Isolate*) const;
+  const String16& source() const { return m_source; }
+  const String16& hash() const;
   int startLine() const { return m_startLine; }
   int startColumn() const { return m_startColumn; }
   int endLine() const { return m_endLine; }
@@ -71,8 +71,9 @@ class V8DebuggerScript {
 
   void setSourceURL(const String16&);
   virtual void setSourceMappingURL(const String16&) = 0;
-  virtual void setSource(v8::Local<v8::String> source) {
-    m_source = toProtocolString(source);
+  void setSource(const String16& source) {
+    m_source = source;
+    m_hash = String16();
   }
 
   virtual bool getPossibleBreakpoints(
@@ -81,6 +82,10 @@ class V8DebuggerScript {
       std::vector<v8::debug::Location>* locations) = 0;
   virtual void resetBlackboxedStateCache() = 0;
 
+  static const int kNoOffset = -1;
+  virtual int offset(int lineNumber, int columnNumber) const = 0;
+  virtual v8::debug::Location location(int offset) const = 0;
+
  protected:
   V8DebuggerScript(v8::Isolate*, String16 id, String16 url);