Add pause/resume for isolates in vmservice/observatory.

runtime/vm/debugger_test.cc

Index: runtime/vm/debugger_test.cc
diff --git a/runtime/vm/debugger_test.cc b/runtime/vm/debugger_test.cc
index 7d16bd1ba13f874b7d7c4b836a092377d2a9dc4d..58d8950b2fef9210ce1ef3599a20455c3dfb2127 100644
--- a/runtime/vm/debugger_test.cc
+++ b/runtime/vm/debugger_test.cc
@@ -69,9 +69,9 @@ static void InspectPausedEvent(Dart_IsolateId isolate_id,
 
   // The debugger knows that it is paused, and why.
   EXPECT(debugger->IsPaused());
-  const Debugger::DebuggerEvent* event = debugger->PauseEvent();
+  const DebuggerEvent* event = debugger->PauseEvent();
   EXPECT(event != NULL);
-  EXPECT(event->type == Debugger::kBreakpointReached);
+  EXPECT(event->type() == DebuggerEvent::kBreakpointReached);
   saw_paused_event = true;
 }