cc: Disable image hijack canvas when tiles don't have images.

cc/playback/raster_source.cc

Index: cc/playback/raster_source.cc
diff --git a/cc/playback/raster_source.cc b/cc/playback/raster_source.cc
index ab0fd5a333269e4e56a1d4e113166c48b28174cf..850a47ed8b0a3454bfd9b6053d612068233317cd 100644
--- a/cc/playback/raster_source.cc
+++ b/cc/playback/raster_source.cc
@@ -100,8 +100,7 @@ void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
     SkipImageCanvas canvas(raster_canvas);
     RasterCommon(&canvas, nullptr, canvas_bitmap_rect, canvas_playback_rect,
                  contents_scale);
-  } else if (settings.use_image_hijack_canvas &&
-             display_list_->MayHaveDiscardableImages()) {
+  } else if (settings.use_image_hijack_canvas) {
     const SkImageInfo& info = raster_canvas->imageInfo();
     ImageHijackCanvas canvas(info.width(), info.height(),
                              image_decode_controller_);