Teach the analyzer about dart:sky.internals.

sky/viewer/internals.cc

Index: sky/viewer/internals.cc
diff --git a/sky/viewer/internals.cc b/sky/viewer/internals.cc
index 1a322669e01e9219b640378a3df4428520de1994..2e825edf782725a64c2d67d49ba696c564eb3fc6 100644
--- a/sky/viewer/internals.cc
+++ b/sky/viewer/internals.cc
@@ -91,10 +91,13 @@ const uint8_t* Symbolizer(Dart_NativeFunction native_function) {
 }
 
 const char kLibraryName[] = "dart:sky.internals";
+
+// When editing this, also update sky/sdk/lib/internals.dart
+// so that the analyzer can see it
 const char kLibrarySource[] = R"DART(
 String contentAsText() native "contentAsText";
-void notifyTestComplete(String test_result) native "notifyTestComplete";
 String renderTreeAsText() native "renderTreeAsText";
+void notifyTestComplete(String test_result) native "notifyTestComplete";
 int takeShellProxyHandle() native "takeShellProxyHandle";
 int takeServicesProvidedByEmbedder() native "takeServicesProvidedByEmbedder";
 int takeServicesProvidedToEmbedder() native "takeServicesProvidedToEmbedder";