pkg/vm_service_client: add getSourceReport to VMServiceReference

lib/src/source_location.dart

Index: lib/src/source_location.dart
diff --git a/lib/src/source_location.dart b/lib/src/source_location.dart
index cfe265129fb50efcd7869f58335dfefd1cb32732..821ffeb090e03cfd09a1ecf163229247d89c32d5 100644
--- a/lib/src/source_location.dart
+++ b/lib/src/source_location.dart
@@ -6,13 +6,16 @@ import 'breakpoint.dart';
 import 'scope.dart';
 import 'script.dart';
 
-VMSourceLocation newVMSourceLocation(Scope scope,
-    Map json) {
+VMSourceLocation newVMSourceLocation(Scope scope, Map json) {
   if (json == null) return null;
   assert(json["type"] == "SourceLocation");
   return new VMSourceLocation._(scope, json);
 }
 
+VMSourceLocation newVMSourceLocationFromPosition(
+        VMScriptRef script, int tokenPos, int endTokenPos) =>
+    new VMSourceLocation._fromPositions(script, tokenPos, endTokenPos);
+
 /// A location or span of code in a Dart script.
 class VMSourceLocation implements VMBreakpointLocation {
   /// The script containing the source location.
@@ -34,6 +37,12 @@ class VMSourceLocation implements VMBreakpointLocation {
         end = newVMScriptToken(
             scope.isolateId, json["script"]["id"], json["endTokenPos"]);
 
+  VMSourceLocation._fromPositions(
+      VMScriptRef script, int tokenPos, int endTokenPos)
+      : this.script = script,
+        token = newVMScriptTokenFromPosition(script, tokenPos),
+        end = newVMScriptTokenFromPosition(script, endTokenPos);
+
   String toString() =>
       end == null ? "$script at $token" : "$script from $token to $end";
 }