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

runtime/embedders/openglui/common/gl_graphics_handler.cc

-// Copyright (c) 2013, 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/gl_graphics_handler.h"
-#include "embedders/openglui/common/log.h"
-
-extern void CheckGLError(const char *function);
-
-void GLGraphicsHandler::SetViewport(int left, int top, int width, int height) {
-  glViewport(left, top, width, height);
-  CheckGLError("glViewPort");
-}
-
-int GLGraphicsHandler::BuildProgram(const char* vertexShaderSource,
-                                 const char* fragmentShaderSource) const {
-  int vertexShader = BuildShader(vertexShaderSource, GL_VERTEX_SHADER);
-  int fragmentShader = BuildShader(fragmentShaderSource, GL_FRAGMENT_SHADER);
-  if (vertexShader < 0 || fragmentShader < 0) {
-    return -1;
-  }
-
-  GLuint programHandle = glCreateProgram();
-  glAttachShader(programHandle, static_cast<GLuint>(vertexShader));
-  glAttachShader(programHandle, static_cast<GLuint>(fragmentShader));
-  glLinkProgram(programHandle);
-
-  GLint linkSuccess;
-  glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
-  if (linkSuccess == GL_FALSE) {
-    GLint infoLogLength;
-    glGetProgramiv(programHandle, GL_INFO_LOG_LENGTH, &infoLogLength);
-    GLchar* strInfoLog = new GLchar[infoLogLength + 1];
-    glGetProgramInfoLog(programHandle, infoLogLength, NULL, strInfoLog);
-    strInfoLog[infoLogLength] = 0;
-    LOGE("Link failed: %s", strInfoLog);
-    delete[] strInfoLog;
-    return -1;
-  }
-  return static_cast<int>(programHandle);
-}
-
-int GLGraphicsHandler::BuildShader(const char* source,
-                                   GLenum shaderType) const {
-  GLuint shaderHandle = glCreateShader(shaderType);
-  glShaderSource(shaderHandle, 1, &source, NULL);
-  glCompileShader(shaderHandle);
-
-  GLint compileSuccess;
-  glGetShaderiv(shaderHandle, GL_COMPILE_STATUS, &compileSuccess);
-
-  if (compileSuccess == GL_FALSE) {
-    GLint infoLogLength = 0;
-    glGetShaderiv(shaderHandle, GL_INFO_LOG_LENGTH, &infoLogLength);
-    GLchar* strInfoLog = new GLchar[infoLogLength + 1];
-    glGetShaderInfoLog(shaderHandle, infoLogLength, NULL, strInfoLog);
-    strInfoLog[infoLogLength] = 0;
-    LOGE("Shader compile failed: %s", strInfoLog);
-    delete [] strInfoLog;
-    return -1;
-  }
-  return static_cast<int>(shaderHandle);
-}
-