cc: Translate the canvas to correctly detect solid colors

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 2f62056b2e6407e7d706e07addecc6735c75c1c4..e00ed54eab7e86c2d876e959a922941dfc05a85d 100644
--- a/cc/resources/picture_pile.cc
+++ b/cc/resources/picture_pile.cc
@@ -570,7 +570,8 @@ void PicturePile::DetermineIfSolidColor() {
   }
   skia::AnalysisCanvas canvas(recorded_viewport_.width(),
                               recorded_viewport_.height());
-  picture->Raster(&canvas, NULL, Region(), 1.0f);
+  canvas.translate(-recorded_viewport_.x(), -recorded_viewport_.y());
+  picture->Raster(&canvas, nullptr, Region(), 1.0f);
   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 }