Remove cullRect() from PaintOpBuffer.

cc/trees/layer_tree_host_pixeltest_tiles.cc

Index: cc/trees/layer_tree_host_pixeltest_tiles.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_tiles.cc b/cc/trees/layer_tree_host_pixeltest_tiles.cc
index f0dcb95a0b77b7f128df3d8a34365880fac88251..e2fc6d64670c09f16622fa0da0d088217aec0858 100644
--- a/cc/trees/layer_tree_host_pixeltest_tiles.cc
+++ b/cc/trees/layer_tree_host_pixeltest_tiles.cc
@@ -113,7 +113,7 @@ class BlueYellowClient : public ContentLayerClient {
 
     PaintRecorder recorder;
     PaintCanvas* canvas =
-        recorder.beginRecording(gfx::RectToSkRect(gfx::Rect(size_)));
+        recorder.beginRecording(gfx::RectToSkRect(PaintableRegion()));
     gfx::Rect top(0, 0, size_.width(), size_.height() / 2);
     gfx::Rect bottom(0, size_.height() / 2, size_.width(), size_.height() / 2);
 
@@ -129,7 +129,8 @@ class BlueYellowClient : public ContentLayerClient {
     canvas->drawRect(gfx::RectToSkRect(yellow_rect), flags);
 
     display_list->CreateAndAppendDrawingItem<DrawingDisplayItem>(
-        PaintableRegion(), recorder.finishRecordingAsPicture());
+        PaintableRegion(), recorder.finishRecordingAsPicture(),
+        gfx::RectToSkRect(PaintableRegion()));
     display_list->Finalize();
     return display_list;
   }