Transition callers from 'concat' to 'transform'

See: https://github.com/flutter/flutter/issues/1080

examples/raw/painting.dart

@@ -39,7 +39,7 @@ ui.Picture paint(ui.Rect paintBounds) {
       0.0, 0.0, 1.0, 0.0,
       0.0, 0.0, 0.0, 1.0,
   ]);
-  canvas.concat(scaleMatrix);
+  canvas.transform(scaleMatrix);
   paint.color = const ui.Color.fromARGB(128, 0, 255, 0);
   canvas.drawCircle(ui.Point.origin, radius, paint);
 

packages/flutter/lib/src/material/material.dart

@@ -379,7 +379,7 @@ class _InkSplash extends InkFeature implements InkSplash {
     Offset originOffset = MatrixUtils.getAsTranslation(transform);
     if (originOffset == null) {
       canvas.save();
-      canvas.concat(transform.storage);
+      canvas.transform(transform.storage);
       if (clipToReferenceBox)
         canvas.clipRect(Point.origin & referenceBox.size);
       if (repositionToReferenceBox)
@@ -465,7 +465,7 @@ class _InkHighlight extends InkFeature implements InkHighlight {
     Offset originOffset = MatrixUtils.getAsTranslation(transform);
     if (originOffset == null) {
       canvas.save();
-      canvas.concat(transform.storage);
+      canvas.transform(transform.storage);
       _paintHighlight(canvas, Point.origin & referenceBox.size, paint);
       canvas.restore();
     } else {

packages/flutter/lib/src/rendering/object.dart

@@ -278,7 +278,7 @@ class PaintingContext {
       Matrix4 offsetMatrix = new Matrix4.translationValues(offset.dx, offset.dy, 0.0);
       Matrix4 transformWithOffset = offsetMatrix * transform;
       canvas.save();
-      canvas.concat(transformWithOffset.storage);
+      canvas.transform(transformWithOffset.storage);
       painter(this, Offset.zero);
       canvas.restore();
     }

packages/flutter_sprites/lib/src/sprite_box.dart

@@ -337,7 +337,7 @@ class SpriteBox extends RenderBox {
 
     // Move to correct coordinate space before drawing
     canvas.translate(offset.dx, offset.dy);
-    canvas.concat(transformMatrix.storage);
+    canvas.transform(transformMatrix.storage);
 
     // Draw the sprite tree
     Matrix4 totalMatrix = new Matrix4.fromFloat64List(canvas.getTotalMatrix());