Android improvements:

runtime/embedders/openglui/common/extension.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 "embedders/openglui/common/extension.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ skipping 905 matching lines @@
   LOGI("PlaySample");
   Dart_EnterScope();
   const char* what = GetArgAsString(arguments, 0);
   int rtn = PlaySoundSample(what);
   SetIntReturnValue(arguments, rtn);
   Dart_ExitScope();
 }
 
 // 2D Canvas.
 
-CanvasContext* display_context;
+CanvasContext* display_context = NULL;
 
 void C2DCreateNativeContext(Dart_NativeArguments arguments) {
   LOGI("In C2DCreateNativeContext");
   Dart_EnterScope();
 
   int handle = GetArgAsInt(arguments, 0);
   int width = GetArgAsInt(arguments, 1);
   int height = GetArgAsInt(arguments, 2);
 
   CanvasContext* rtn = new CanvasContext(handle, width, height);
   if (display_context == NULL) {
+    LOGI("Created display context");
     display_context = rtn;
   }
   Dart_ExitScope();
   LOGI("Out C2DCreateNativeContext");
 }
 
 void C2DSetWidth(Dart_NativeArguments arguments) {
   LOGI("In C2DSetWidth");
   Dart_EnterScope();
   int handle = GetArgAsInt(arguments, 0);
@@ skipping 699 matching lines @@
   HandleError(Dart_StringToCString(name, &cname));
   for (int i = 0; function_list[i].name != NULL; ++i) {
     if (strcmp(function_list[i].name, cname) == 0) {
       result = function_list[i].function;
       break;
     }
   }
   Dart_ExitScope();
   return result;
 }