Only show breakpoints at possible breakpoint positions in Observatory.

runtime/observatory/lib/src/debugger/debugger_location.dart

 // Copyright (c) 2015, 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.
 
 part of debugger;
 
 class DebuggerLocation {
   DebuggerLocation.file(this.script, this.line, this.col);
   DebuggerLocation.func(this.function);
   DebuggerLocation.error(this.errorMessage);
@@ skipping 383 matching lines @@
           await _lookupScript(debugger.isolate, scriptName, allowPrefix:false);
       if (scripts.isEmpty) {
         return [];
       }
       var script = scripts[0];
       await script.load();
       if (!lineStrComplete) {
         // Complete the line.
         var sharedPrefix = '${script.name}:';
         List completions = [];
-        for (var line in script.lines) {
-          if (line.possibleBpt) {
-            var currentLineStr = line.line.toString();
-            if (currentLineStr.startsWith(lineStr)) {
-              completions.add('${sharedPrefix}${currentLineStr} ');
-              completions.add('${sharedPrefix}${currentLineStr}:');
-            }
+        var report = await script.isolate.getSourceReport(
+            [Isolate.kPossibleBreakpointsReport], script);
+        Set<int> possibleBpts = getPossibleBreakpointLines(report, script);
+        for (var line in possibleBpts) {
+          var currentLineStr = line.toString();
+          if (currentLineStr.startsWith(lineStr)) {
+            completions.add('${sharedPrefix}${currentLineStr} ');
+            completions.add('${sharedPrefix}${currentLineStr}:');
           }
         }
         return completions;
 
       } else {
         // Complete the column.
         int lineNum = int.parse(lineStr);
         var scriptLine = script.getLine(lineNum);
-        if (!scriptLine.possibleBpt) {
-          return [];
-        }
         var sharedPrefix = '${script.name}:${lineStr}:';
         List completions = [];
         int maxCol = scriptLine.text.trimRight().runes.length;
         for (int i = 1; i <= maxCol; i++) {
           var currentColStr = i.toString();
           if (currentColStr.startsWith(colStr)) {
             completions.add('${sharedPrefix}${currentColStr} ');
           }
         }
         return completions;
@@ skipping 14 matching lines @@
     return 'invalid source location (${errorMessage})';
   }
 
   Script script;
   int line;
   int col;
   ServiceFunction function;
   String errorMessage;
   bool get valid => (errorMessage == null);
 }