cc: Do not cleanup tiles with raster tasks.

cc/resources/prioritized_tile_set.cc

Index: cc/resources/prioritized_tile_set.cc
diff --git a/cc/resources/prioritized_tile_set.cc b/cc/resources/prioritized_tile_set.cc
index b7b3b5a741eee424707201abc7453cfbb776d115..41e7867b635468a1302fd852483e04270be53bcd 100644
--- a/cc/resources/prioritized_tile_set.cc
+++ b/cc/resources/prioritized_tile_set.cc
@@ -81,6 +81,14 @@ void PrioritizedTileSet::Clear() {
   }
 }
 
+bool PrioritizedTileSet::Empty() {

[vmpstr, 2014/08/01 16:03:16]

nit: I think the convention is to name this "IsEmpty"

[sohanjg, 2014/08/04 06:25:03]

Done.
Renamed, std::vector seems to be using ::Empty, is it convention for containers
you mean here ?

[vmpstr, 2014/08/04 16:04:40]

Yeah cc containers or any thing that has a concept of being empty is more often
IsEmpty, stl is still ::empty :)

+  for (int bin = 0; bin < NUM_BINS; ++bin)
+    if (!tiles_[bin].empty())
+      return false;
+
+  return true;
+}
+
 void PrioritizedTileSet::SortBinIfNeeded(ManagedTileBin bin) {
   if (!bin_sorted_[bin]) {
     SortBinTiles(bin, &tiles_[bin]);