cc: Fix size_t to int truncations in tiles/ and trees/

cc/tiles/tiling_set_eviction_queue.cc

Index: cc/tiles/tiling_set_eviction_queue.cc
diff --git a/cc/tiles/tiling_set_eviction_queue.cc b/cc/tiles/tiling_set_eviction_queue.cc
index 9329d0db29ab1dd2a571a07266d439043f14942a..65bfdb2708a263e3a9aaa64d7bb296509e873711 100644
--- a/cc/tiles/tiling_set_eviction_queue.cc
+++ b/cc/tiles/tiling_set_eviction_queue.cc
@@ -33,37 +33,39 @@ void TilingSetEvictionQueue::GenerateTilingOrder(
   // for this class.
   PictureLayerTilingSet::TilingRange range =
       tiling_set->GetTilingRange(PictureLayerTilingSet::HIGHER_THAN_HIGH_RES);
-  for (int i = range.start; i < range.end; ++i) {
-    PictureLayerTiling* tiling = tiling_set->tiling_at(i);
+  for (size_t index = range.start; index < range.end; ++index) {
+    PictureLayerTiling* tiling = tiling_set->tiling_at(index);
     if (tiling->has_tiles())
       tilings_.push_back(tiling);
   }
 
   range = tiling_set->GetTilingRange(PictureLayerTilingSet::LOWER_THAN_LOW_RES);
-  for (int i = range.end - 1; i >= range.start; --i) {
-    PictureLayerTiling* tiling = tiling_set->tiling_at(i);
+  for (size_t i = range.start; i < range.end; ++i) {
+    size_t index = range.start + (range.end - 1 - i);
+    PictureLayerTiling* tiling = tiling_set->tiling_at(index);
     if (tiling->has_tiles())
       tilings_.push_back(tiling);
   }
 
   range = tiling_set->GetTilingRange(
       PictureLayerTilingSet::BETWEEN_HIGH_AND_LOW_RES);
-  for (int i = range.end - 1; i >= range.start; --i) {
-    PictureLayerTiling* tiling = tiling_set->tiling_at(i);
+  for (size_t i = range.start; i < range.end; ++i) {
+    size_t index = range.start + (range.end - 1 - i);
+    PictureLayerTiling* tiling = tiling_set->tiling_at(index);
     if (tiling->has_tiles())
       tilings_.push_back(tiling);
   }
 
   range = tiling_set->GetTilingRange(PictureLayerTilingSet::LOW_RES);
-  for (int i = range.start; i < range.end; ++i) {
-    PictureLayerTiling* tiling = tiling_set->tiling_at(i);
+  for (size_t index = range.start; index < range.end; ++index) {
+    PictureLayerTiling* tiling = tiling_set->tiling_at(index);
     if (tiling->has_tiles())
       tilings_.push_back(tiling);
   }
 
   range = tiling_set->GetTilingRange(PictureLayerTilingSet::HIGH_RES);
-  for (int i = range.start; i < range.end; ++i) {
-    PictureLayerTiling* tiling = tiling_set->tiling_at(i);
+  for (size_t index = range.start; index < range.end; ++index) {
+    PictureLayerTiling* tiling = tiling_set->tiling_at(index);
     if (tiling->has_tiles())
       tilings_.push_back(tiling);
   }