Allow one-copy task tile worker pool to use compressed textures.

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 0849c516bab58e63b183c957eb877e748f85187a..0a6e8a5e0320f6bb89e0e068ff89239b3dbff3e4 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -48,6 +48,10 @@ const int kMinHeightForGpuRasteredTile = 256;
 // of using the same tile size.
 const int kTileRoundUp = 64;
 
+// For performance reasons and to support compressed tile textures, tile
+// width and height should be an even multiple of 4 in size.
+const int kTileMinimalAlignment = 4;
+
 }  // namespace
 
 namespace cc {
@@ -767,6 +771,14 @@ gfx::Size PictureLayerImpl::CalculateTileSize(
     tile_height = std::min(tile_height, default_tile_height);
   }
 
+  // Ensure that tile width and height are properly aligned.
+  if (tile_width % kTileMinimalAlignment != 0 ||
+      tile_height % kTileMinimalAlignment != 0) {

[reveman, 2015/12/02 18:27:18]

nit: remove these checks and execute UncheckedRoundUp unconditionally

[christiank, 2015/12/03 12:57:59]

Done.

+    tile_width = MathUtil::UncheckedRoundUp(tile_width, kTileMinimalAlignment);
+    tile_height =
+        MathUtil::UncheckedRoundUp(tile_height, kTileMinimalAlignment);
+  }
+
   // Under no circumstance should we be larger than the max texture size.
   tile_width = std::min(tile_width, max_texture_size);
   tile_height = std::min(tile_height, max_texture_size);