Flesh out the Painting API a bit.

sky/engine/core/painting/PaintingContext.cpp

Index: sky/engine/core/painting/PaintingContext.cpp
diff --git a/sky/engine/core/painting/PaintingContext.cpp b/sky/engine/core/painting/PaintingContext.cpp
index 0bac4898e52ba248bbd421c8bbed01ef0073a218..f2cdde77244a6805e580cbec593dab1a56d5a593 100644
--- a/sky/engine/core/painting/PaintingContext.cpp
+++ b/sky/engine/core/painting/PaintingContext.cpp
@@ -13,6 +13,14 @@
 
 namespace blink {
 
+SkRect toSkRect(Vector<float> rect)
+{
+    ASSERT(rect.size() == 4);
+    SkRect sk_rect;
+    sk_rect.set(rect[0], rect[1], rect[2], rect[3]);
+    return sk_rect;
+}
+
 PassRefPtr<PaintingContext> PaintingContext::create(PassRefPtr<Element> element, const FloatSize& size)
 {
     return adoptRef(new PaintingContext(element, size));
@@ -30,6 +38,112 @@ PaintingContext::~PaintingContext()
 {
 }
 
+void PaintingContext::save()
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    m_canvas->save();
+}
+
+void PaintingContext::saveLayer(Vector<float> bounds, Paint* paint)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    SkRect sk_bounds;
+    if (bounds.size() != 0)
+      sk_bounds = toSkRect(bounds);
+    m_canvas->saveLayer(bounds.size() != 0 ? &sk_bounds : nullptr,
+                        paint ? &paint->paint() : nullptr);
+}
+
+void PaintingContext::restore()
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    m_canvas->restore();
+}
+
+void PaintingContext::translate(float dx, float dy)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    m_canvas->translate(dx, dy);
+}
+
+void PaintingContext::scale(float sx, float sy)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    m_canvas->scale(sx, sy);
+}
+
+void PaintingContext::rotate(float degrees)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    m_canvas->rotate(degrees);
+}
+
+void PaintingContext::skew(float sx, float sy)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    m_canvas->skew(sx, sy);
+}
+
+void PaintingContext::concat(Vector<float> matrix)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    ASSERT(matrix.size() == 9);
+    SkMatrix sk_matrix;
+    sk_matrix.set9(matrix.data());
+    m_canvas->concat(sk_matrix);
+}
+
+void PaintingContext::clipRect(Vector<float> rect)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(m_displayList->isRecording());
+    m_canvas->clipRect(toSkRect(rect));
+}
+
+void PaintingContext::drawPaint(Paint* paint)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(paint);
+    ASSERT(m_displayList->isRecording());
+    m_canvas->drawPaint(paint->paint());
+}
+
+void PaintingContext::drawOval(Vector<float> rect, Paint* paint)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(paint);
+    ASSERT(m_displayList->isRecording());
+    m_canvas->drawOval(toSkRect(rect), paint->paint());
+}
+
+void PaintingContext::drawRect(Vector<float> rect, Paint* paint)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(paint);
+    ASSERT(m_displayList->isRecording());
+    m_canvas->drawRect(toSkRect(rect), paint->paint());
+}
+
 void PaintingContext::drawCircle(double x, double y, double radius, Paint* paint)
 {
     if (!m_canvas)