cc: Cull DrawingDisplayItems outside of the raster playback rect

cc/playback/drawing_display_item.cc

Index: cc/playback/drawing_display_item.cc
diff --git a/cc/playback/drawing_display_item.cc b/cc/playback/drawing_display_item.cc
index 569030b9a118cd7db74d243ffb2002bcd7f80d3a..6cebed2ae005fd3767a7af3f4cfb576cd3b0abb2 100644
--- a/cc/playback/drawing_display_item.cc
+++ b/cc/playback/drawing_display_item.cc
@@ -13,6 +13,7 @@
 #include "third_party/skia/include/core/SkMatrix.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/utils/SkPictureUtils.h"
+#include "ui/gfx/skia_util.h"
 
 namespace cc {
 
@@ -30,7 +31,18 @@ void DrawingDisplayItem::SetNew(skia::RefPtr<SkPicture> picture) {
 }
 
 void DrawingDisplayItem::Raster(SkCanvas* canvas,
+                                const gfx::Rect& canvas_target_playback_rect,
                                 SkPicture::AbortCallback* callback) const {
+  // The canvas_playback_rect can be empty to signify no culling is desired.
+  if (!canvas_target_playback_rect.IsEmpty()) {
+    const SkMatrix& matrix = canvas->getTotalMatrix();
+    const SkRect& cull_rect = picture_->cullRect();
+    SkRect target_rect;
+    matrix.mapRect(&target_rect, cull_rect);
+    if (!target_rect.intersect(gfx::RectToSkRect(canvas_target_playback_rect)))
+      return;
+  }
+
   // SkPicture always does a wrapping save/restore on the canvas, so it is not
   // necessary here.
   if (callback)