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..bc20f29f6bda89f53c5dbc1a5a3814904f506e48 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);