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

runtime/embedders/openglui/common/canvas_context.cc

Index: runtime/embedders/openglui/common/canvas_context.cc
===================================================================
--- runtime/embedders/openglui/common/canvas_context.cc	(revision 0)
+++ runtime/embedders/openglui/common/canvas_context.cc	(revision 0)
@@ -0,0 +1,66 @@
+// 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/canvas_context.h"
+
+#include <ctype.h>
+#include <string.h>
+
+#include "embedders/openglui/common/support.h"
+
+CanvasContext::CanvasContext(int16_t widthp, int16_t heightp)
+  : canvas_(NULL),
+    width_(widthp),
+    height_(heightp),
+    imageSmoothingEnabled_(true),
+    state_(NULL) {
+}
+
+CanvasContext::~CanvasContext() {
+  delete state_;
+  delete canvas_;
+}
+
+void CanvasContext::Create() {
+  canvas_ = graphics->CreateCanvas();
+  state_ = new CanvasState(canvas_);
+}
+
+void CanvasContext::DrawImage(const char* src_url,
+                              int sx, int sy,
+                              bool has_src_dimensions, int sw, int sh,
+                              int dx, int dy,
+                              bool has_dst_dimensions, int dw, int dh) {
+  SkBitmap bm;
+  // TODO(gram): We need a way to remap URLs to local file names.
+  // For now I am just using the characters after the last '/'.
+  // Note also that if we want to support URLs and network fetches,
+  // then we introduce more complexity; this can't just be an URL.

[vsm, 2013/02/04 18:18:41]

We might want to abstract this out with some concept of Asset or Resource.

[gram, 2013/02/04 22:02:28]

I agree, but I think that can wait for a later CL; this doesn't work yet as it
is.

+  int pos = strlen(src_url);
+  while (--pos >= 0 && src_url[pos] != '/');
+  const char *path = src_url + pos + 1;
+  if (!SkImageDecoder::DecodeFile(path, &bm)) {
+    LOGI("Image decode of %s failed", path);
+  } else {
+    LOGI("Decode image: width=%d,height=%d", bm.width(), bm.height());
+    if (!has_src_dimensions) {
+      sw = bm.width();
+      sh = bm.height();
+    }
+    if (!has_dst_dimensions) {
+      dw = bm.width();
+      dh = bm.height();
+    }
+    state_->DrawImage(bm, sx, sy, sw, sh, dx, dy, dw, dh);
+  }
+}
+
+void CanvasContext::ClearRect(float left, float top,
+                              float width, float height) {
+  SkPaint paint;
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setColor(0xFFFFFFFF);
+  canvas_->drawRectCoords(left, top, left + width, top + height, paint);
+}
+