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

runtime/embedders/openglui/common/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/graphics_handler.h"
+#include "embedders/openglui/common/canvas_context.h"
 #include "embedders/openglui/common/log.h"
 
 extern void CheckGLError(const char *function);
 
-void GLGraphicsHandler::SetViewport(int left, int top, int width, int height) {
+GraphicsHandler* graphics;
+
+GraphicsHandler::GraphicsHandler()
+  : ag(),
+    grcontext(NULL),
+    width_(0),
+    height_(0) {
+  graphics = this;
+}
+
+// Kludge to get around an issue with Android emulator, which returns
+// NULL for the shader language version, causing Skia to blow up.
+const GrGLubyte* myGLGetString(GLenum name) {
+  const GrGLubyte* str = glGetString(name);
+  if (NULL == str && GL_SHADING_LANGUAGE_VERSION == name) {
+    return reinterpret_cast<GrGLubyte*>(
+        const_cast<char*>("OpenGL ES GLSL ES 1.0"));
+  } else {
+    return str;
+  }
+}
+
+int32_t GraphicsHandler::Start() {
+  SkGraphics::Init();
+  GrGLInterface* fGL = const_cast<GrGLInterface*>(GrGLCreateNativeInterface());
+  LOGI("Created native interface %s\n", fGL ? "succeeded" : "failed");
+  fGL->fGetString = myGLGetString;
+  grcontext = GrContext::Create(kOpenGL_Shaders_GrEngine,
+                        (GrPlatform3DContext)fGL);
+  LOGI("Created GrContext %s\n", grcontext ? "succeeded" : "failed");
+  return 0;
+}
+
+void GraphicsHandler::Stop() {
+  SkGraphics::Term();
+}
+
+SkCanvas* GraphicsHandler::CreateCanvas() {
+  GrPlatformRenderTargetDesc desc;
+  desc.fWidth = width_;
+  desc.fHeight = height_;
+  desc.fConfig = kSkia8888_PM_GrPixelConfig;
+  glGetIntegerv(GL_SAMPLES, &desc.fSampleCnt);
+  glGetIntegerv(GL_STENCIL_BITS, &desc.fStencilBits);
+  GrGLint buffer;
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &buffer);
+  desc.fRenderTargetHandle = buffer;
+  GrRenderTarget* fGrRenderTarget = grcontext->createPlatformRenderTarget(desc);
+  return new SkCanvas(new SkGpuDevice(grcontext, fGrRenderTarget));
+}
+
+void GraphicsHandler::SetViewport(int left, int top, int width, int height) {
+  width_ = width;
+  height_ = 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;
+int32_t GraphicsHandler::Update() {
+  extern CanvasContext* display_context;
+  if (display_context != NULL) {
+    LOGI("Flushing display context\n");
+    display_context->Flush();
   }
-
-  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);
+  SwapBuffers();
+  return 0;
 }
 
-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);
-}