Define SK_SAVE_LAYER_BOUNDS_ARE_FILTERED for an upcoming Skia change.

cc/playback/filter_display_item.cc

Index: cc/playback/filter_display_item.cc
diff --git a/cc/playback/filter_display_item.cc b/cc/playback/filter_display_item.cc
index fbed01509c80ff21641cf5083e9321315af56329..ce558c8b493fd75f60ac93c34b75764c9f538e17 100644
--- a/cc/playback/filter_display_item.cc
+++ b/cc/playback/filter_display_item.cc
@@ -43,9 +43,13 @@ void FilterDisplayItem::Raster(SkCanvas* canvas,
   skia::RefPtr<SkImageFilter> image_filter =
       RenderSurfaceFilters::BuildImageFilter(
           filters_, gfx::SizeF(bounds_.width(), bounds_.height()));
+#ifdef SK_SAVE_LAYER_BOUNDS_ARE_FILTERED

[danakj, 2015/08/27 18:34:02]

leave a TODO pointing to the bug to remove this

[Stephen White, 2015/08/27 19:26:39]

Done.

   SkRect boundaries;
   image_filter->computeFastBounds(
       SkRect::MakeWH(bounds_.width(), bounds_.height()), &boundaries);
+#else
+  SkRect boundaries = SkRect::MakeWH(bounds_.width(), bounds_.height());
+#endif
 
   SkPaint paint;
   paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);