Make Script::GetTokenLocation() and Script::TokenRangeAtLine() use token streams where possible.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2243 matching lines @@
   RawString* GetSnippet(intptr_t from_line,
                         intptr_t from_column,
                         intptr_t to_line,
                         intptr_t to_column) const;
 
   void SetLocationOffset(intptr_t line_offset, intptr_t col_offset) const;
 
   void GetTokenLocation(intptr_t token_pos,
                         intptr_t* line, intptr_t* column) const;
 
+  // Returns index of first and last token on the given line. Returns both
+  // indices < 0 if no token exists on or after the line. If a token exists
+  // after, but not on given line, returns in *first_token_index the index of
+  // the first token after the line, and a negative value in *last_token_index.
   void TokenRangeAtLine(intptr_t line_number,
                         intptr_t* first_token_index,
                         intptr_t* last_token_index) const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawScript));
   }
 
   static RawScript* New(const String& url,
                         const String& source,
@@ skipping 3902 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_