Canvas API. There are still a number of things to do:

runtime/embedders/openglui/emulator/emulator_embedder.cc

Index: runtime/embedders/openglui/emulator/emulator_embedder.cc
===================================================================
--- runtime/embedders/openglui/emulator/emulator_embedder.cc	(revision 17737)
+++ runtime/embedders/openglui/emulator/emulator_embedder.cc	(working copy)
@@ -5,7 +5,8 @@
 #include "embedders/openglui/emulator/emulator_embedder.h"
 
 #include <string.h>
-
+#include <sys/time.h>
+#include "embedders/openglui/common/canvas_context.h"
 #include "embedders/openglui/common/context.h"
 #include "embedders/openglui/common/dart_host.h"
 #include "embedders/openglui/common/events.h"
@@ -17,27 +18,44 @@
 InputHandler* input_handler_ptr;
 LifeCycleHandler* lifecycle_handler_ptr;
 
+struct timeval tvStart;
+void tick(int data);
+
 void display() {
-    glClearColor(1.0, 1.0, 1.0, 1.0);
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-    lifecycle_handler_ptr->OnStep();
-    glutSwapBuffers();
+  // Get number of msecs since last call.
+  struct timeval tvEnd;
+  gettimeofday(&tvEnd, NULL);
+  uint64_t elapsed = (tvEnd.tv_usec + 1000000 * tvEnd.tv_sec) -
+                 (tvStart.tv_usec + 1000000 * tvStart.tv_sec);
+
+  if (lifecycle_handler_ptr->OnStep() != 0) {
+    exit(-1);
+  }
+  // Schedule next call, trying to aim for 60fps.
+  int delay = 1000 / 60 - (elapsed / 1000);
+  if (delay < 0) delay = 0;
+  tvStart = tvEnd;
+  glutTimerFunc(delay, tick, 0);
 }
 
+void tick(int data) {
+  display();
+}
+
 void reshape(int width, int height) {
-    glViewport(0, 0, width, height);
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    glOrtho(0, width, 0, height, -1, 1);
-    glMatrixMode(GL_MODELVIEW);
-    glutPostRedisplay();
+  glViewport(0, 0, width, height);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  glOrtho(0, width, 0, height, -1, 1);
+  glMatrixMode(GL_MODELVIEW);
+  glutPostRedisplay();
 }
 
 void keyboard(unsigned char key, int x, int y) {
   input_handler_ptr->OnKeyEvent(kKeyDown, time(0), 0, key, 0, 0);
   input_handler_ptr->OnKeyEvent(kKeyUp, time(0), 0, key, 0, 0);
   if (key == 27) {
-      exit(0);
+    exit(0);
   }
 }
 
@@ -63,11 +81,12 @@
   app_context.vm_glue = &vm_glue;
   DartHost host(&app_context);
   lifecycle_handler_ptr = &host;
-  lifecycle_handler_ptr->OnActivate();
   glutReshapeFunc(reshape);
   glutDisplayFunc(display);
   glutKeyboardFunc(keyboard);
-  glutIdleFunc(display);
+  lifecycle_handler_ptr->OnActivate();
+  gettimeofday(&tvStart, NULL);
+  glutTimerFunc(1, tick, 0);
   glutMainLoop();
 }