cc: Use GetSize instead of recorded_viewport_

cc/resources/picture_pile.cc

Index: cc/resources/picture_pile.cc
diff --git a/cc/resources/picture_pile.cc b/cc/resources/picture_pile.cc
index 698fe2c2b172660fd8419bb5556c525039578e40..31bc2d350b61250613245fdb674f087253a4a3f9 100644
--- a/cc/resources/picture_pile.cc
+++ b/cc/resources/picture_pile.cc
@@ -693,9 +693,10 @@ void PicturePile::DetermineIfSolidColor() {
     if (it->second.GetPicture() != picture)
       return;
   }
-  skia::AnalysisCanvas canvas(recorded_viewport_.width(),
-                              recorded_viewport_.height());
-  canvas.translate(-recorded_viewport_.x(), -recorded_viewport_.y());
+
+  gfx::Size layer_size = GetSize();
+  skia::AnalysisCanvas canvas(layer_size.width(), layer_size.height());
+
   picture->Raster(&canvas, nullptr, Region(), 1.0f);
   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 }