Flesh out the Painting API a bit.

sky/engine/core/painting/PaintingContext.h

Index: sky/engine/core/painting/PaintingContext.h
diff --git a/sky/engine/core/painting/PaintingContext.h b/sky/engine/core/painting/PaintingContext.h
index 2c082522213f507a79707e6c1bb73e0b4388426c..16a7da547ac908c08c1be91bb6720588add69e1a 100644
--- a/sky/engine/core/painting/PaintingContext.h
+++ b/sky/engine/core/painting/PaintingContext.h
@@ -10,6 +10,7 @@
 #include "sky/engine/tonic/dart_wrappable.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
+#include "sky/engine/wtf/Vector.h"
 
 namespace blink {
 class Element;
@@ -23,7 +24,23 @@ public:
     double height() const { return m_size.height(); }
     double width() const { return m_size.width(); }
 
+    void save();
+    void saveLayer(Vector<float> bounds, Paint* paint);
+    void restore();
+
+    void translate(float dx, float dy);
+    void scale(float sx, float sy);
+    void rotate(float degrees);
+    void skew(float sx, float sy);
+    void concat(Vector<float> matrix);
+
+    void clipRect(Vector<float> rect);
+
+    void drawPaint(Paint* paint);
+    void drawRect(Vector<float> rect, Paint* paint);
+    void drawOval(Vector<float> rect, Paint* paint);
     void drawCircle(double x, double y, double radius, Paint* paint);
+
     void commit();
 
 private: