cc: Remove tile sharing from tilings.

cc/resources/tiling_set_raster_queue_required.cc

Index: cc/resources/tiling_set_raster_queue_required.cc
diff --git a/cc/resources/tiling_set_raster_queue_required.cc b/cc/resources/tiling_set_raster_queue_required.cc
index 89ddb044255ed905ddcb963dffd62276e324305b..6673a60b871299d6e39057645c302cea4fe37bfb 100644
--- a/cc/resources/tiling_set_raster_queue_required.cc
+++ b/cc/resources/tiling_set_raster_queue_required.cc
@@ -31,7 +31,13 @@ TilingSetRasterQueueRequired::TilingSetRasterQueueRequired(
   if (!tiling)
     return;
 
-  iterator_ = TilingIterator(tiling, &tiling->tiling_data_);
+  if (type == RasterTilePriorityQueue::Type::REQUIRED_FOR_ACTIVATION) {
+    iterator_ = TilingIterator(tiling, &tiling->tiling_data_,
+                               tiling->pending_visible_rect());
+  } else {
+    iterator_ = TilingIterator(tiling, &tiling->tiling_data_,
+                               tiling->current_visible_rect());
+  }
   while (!iterator_.done() && !IsTileRequired(*iterator_))
     ++iterator_;
 }
@@ -73,19 +79,11 @@ TilingSetRasterQueueRequired::TilingIterator::TilingIterator()
 
 TilingSetRasterQueueRequired::TilingIterator::TilingIterator(
     PictureLayerTiling* tiling,
-    TilingData* tiling_data)
+    TilingData* tiling_data,
+    const gfx::Rect& rect)
     : tiling_(tiling), tiling_data_(tiling_data), current_tile_(nullptr) {
-  if (!tiling_->has_visible_rect_tiles()) {
-    // Verify that if we would create the iterator, then it would be empty (ie
-    // it would return false when evaluated as a bool).
-    DCHECK(!TilingData::Iterator(tiling_data_, tiling->current_visible_rect(),
-                                 false));
-    return;
-  }
-
   visible_iterator_ =
-      TilingData::Iterator(tiling_data_, tiling_->current_visible_rect(),
-                           false /* include_borders */);
+      TilingData::Iterator(tiling_data_, rect, false /* include_borders */);
   if (!visible_iterator_)
     return;