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

cc/tiles/tile_manager.h

Index: cc/tiles/tile_manager.h
diff --git a/cc/tiles/tile_manager.h b/cc/tiles/tile_manager.h
index 8611b3a361584402d4c2d3d2917e9ab18edcf078..f8994c2f1e672d2e8efd5e5bfc8bb6310384c77f 100644
--- a/cc/tiles/tile_manager.h
+++ b/cc/tiles/tile_manager.h
@@ -213,7 +213,7 @@ class CC_EXPORT TileManager : public TileTaskRunnerClient {
   class MemoryUsage {
    public:
     MemoryUsage();
-    MemoryUsage(int64 memory_bytes, int resource_count);
+    MemoryUsage(size_t memory_bytes, size_t resource_count);
 
     static MemoryUsage FromConfig(const gfx::Size& size, ResourceFormat format);
     static MemoryUsage FromTile(const Tile* tile);
@@ -223,7 +223,11 @@ class CC_EXPORT TileManager : public TileTaskRunnerClient {
     MemoryUsage operator-(const MemoryUsage& other);
 
     bool Exceeds(const MemoryUsage& limit) const;
-    int64 memory_bytes() const { return memory_bytes_; }
+    size_t memory_bytes() const {
+      // This is used for HUD layers / logging, so we can just static_cast here.
+      DCHECK_GE(memory_bytes_, 0);
+      return static_cast<size_t>(memory_bytes_);
+    }
 
    private:
     int64 memory_bytes_;

[danakj, 2015/06/09 17:39:49]

why not size_ts here?