cc: Add DEFINE_ENUM macro.

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 d1cc5b7f80c5aed7a365fbe842b51d3c43283a11..c59e53e38e37ffa7676237665aa191c0721a787c 100644
--- a/cc/resources/prioritized_tile_set.cc
+++ b/cc/resources/prioritized_tile_set.cc
@@ -51,7 +51,7 @@ typedef std::vector<Tile*> TileVector;
 void SortBinTiles(ManagedTileBin bin, TileVector* tiles) {
   switch (bin) {
     case NOW_AND_READY_TO_DRAW_BIN:
-      break;
+      return;
     case NOW_BIN:
     case SOON_BIN:
     case EVENTUALLY_AND_ACTIVE_BIN:
@@ -59,16 +59,15 @@ void SortBinTiles(ManagedTileBin bin, TileVector* tiles) {
     case NEVER_AND_ACTIVE_BIN:
     case NEVER_BIN:
       std::sort(tiles->begin(), tiles->end(), BinComparator());
-      break;
-    default:
-      NOTREACHED();
+      return;
   }
+  NOTREACHED();
 }
 
 }  // namespace
 
 PrioritizedTileSet::PrioritizedTileSet() {
-  for (int bin = 0; bin < NUM_BINS; ++bin)
+  for (int bin = 0; bin < ManagedTileBin_ARRAYSIZE; ++bin)
     bin_sorted_[bin] = true;
 }
 
@@ -80,7 +79,7 @@ void PrioritizedTileSet::InsertTile(Tile* tile, ManagedTileBin bin) {
 }
 
 void PrioritizedTileSet::Clear() {
-  for (int bin = 0; bin < NUM_BINS; ++bin) {
+  for (int bin = 0; bin < ManagedTileBin_ARRAYSIZE; ++bin) {
     tiles_[bin].clear();
     bin_sorted_[bin] = true;
   }