Support column-based breakpoints in the VM and Observatory.

runtime/vm/debugger_api_impl.cc

 // 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.
 
 #include "include/dart_tools_api.h"
 
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 343 matching lines @@
 
 DART_EXPORT Dart_Handle Dart_GetBreakpointLine(intptr_t bp_id) {
   DARTSCOPE(Thread::Current());
   Debugger* debugger = I->debugger();
 
   Breakpoint* bpt = debugger->GetBreakpointById(bp_id);
   if (bpt == NULL) {
     return Api::NewError("%s: breakpoint with id %" Pd " does not exist",
                          CURRENT_FUNC, bp_id);
   }
-  return Dart_NewInteger(bpt->bpt_location()->LineNumber());
+  if (bpt->bpt_location()->IsResolved()) {
+    return Dart_NewInteger(bpt->bpt_location()->LineNumber());
+  } else {
+    return Dart_NewInteger(bpt->bpt_location()->requested_line_number());
+  }
 }
 
 
 DART_EXPORT Dart_Handle Dart_SetBreakpointAtEntry(
                             Dart_Handle library_in,
                             Dart_Handle class_name_in,
                             Dart_Handle function_name_in) {
   DARTSCOPE(Thread::Current());
   UNWRAP_AND_CHECK_PARAM(Library, library, library_in);
   UNWRAP_AND_CHECK_PARAM(String, class_name, class_name_in);
@@ skipping 551 matching lines @@
   return Api::CastIsolate(isolate);
 }
 
 
 DART_EXPORT Dart_IsolateId Dart_GetIsolateId(Dart_Isolate dart_isolate) {
   Isolate* isolate = reinterpret_cast<Isolate*>(dart_isolate);
   return isolate->debugger()->GetIsolateId();
 }
 
 }  // namespace dart