Use proxy canvas size.

The old code just hard coded 1,1 as size. Instead use the size of the
proxy canvas.

Change-Id: Ib1ebc9339c98680ca350f26f8ec514f6782de8a4
Reviewed-on: https://skia-review.googlesource.com/9160
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Herb Derby <herb@google.com>

src/utils/SkDeferredCanvas.cpp

@@ -46,7 +46,7 @@ void SkDeferredCanvas::Rec::setConcat(const SkMatrix& m) {
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 SkDeferredCanvas::SkDeferredCanvas(SkCanvas* canvas)
-    : INHERITED(1, 1) {
+    : INHERITED(canvas->getBaseLayerSize().width(), canvas->getBaseLayerSize().height()) {
     this->reset(canvas);
 }