cc: Remove save/restore from DrawingDisplayItem::Raster.

cc/resources/drawing_display_item.cc

Index: cc/resources/drawing_display_item.cc
diff --git a/cc/resources/drawing_display_item.cc b/cc/resources/drawing_display_item.cc
index 91ab3fb0d38103b37a08a0ab9e8a9c25df79ee49..4bf9e8aebeb212c0644c4fef3f3b228f6d288cab 100644
--- a/cc/resources/drawing_display_item.cc
+++ b/cc/resources/drawing_display_item.cc
@@ -26,12 +26,10 @@ DrawingDisplayItem::~DrawingDisplayItem() {
 
 void DrawingDisplayItem::Raster(SkCanvas* canvas,
                                 SkDrawPictureCallback* callback) const {
-  canvas->save();

[danakj, 2015/04/28 21:46:41]

could you say this in a comment here?

[jbroman, 2015/04/28 21:48:16]

Done. Was debating whether I should.

   if (callback)
     picture_->playback(canvas, callback);
   else
     canvas->drawPicture(picture_.get());

[ajuma, 2015/04/28 21:48:50]

Does drawPicture also guarantee save/restore?

[jbroman, 2015/04/28 21:55:33]

Yes.

It always dispatches either to SkRecordDraw, which does (via
SkCanvas::drawPicture -> SkCanvas::onDrawPicture -> SkPicture::playback), the
usual path, or to GrRecordReplaceDraw (via SkCanvas::drawPicture ->
SkCanvas::onDrawPicture -> SkGpuDevice::EXPERIMENTAL_drawPicture).

-  canvas->restore();
 }
 
 bool DrawingDisplayItem::IsSuitableForGpuRasterization() const {