Made top controls work with virtual viewport pinch-to-zoom. (Chromium)

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 302bda43088490d68f4f303404197e44d5cc0995..35fb0fa86282fc838a8bf2f948d6d5734ca0b713 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -1169,7 +1169,10 @@ gfx::ScrollOffset LayerImpl::MaxScrollOffset() const {
   DCHECK(this != layer_tree_impl()->InnerViewportScrollLayer() ||
          IsContainerForFixedPositionLayers());
 
-  gfx::SizeF scaled_scroll_bounds(bounds());
+  // Don't use LayerImpl::bounds() since it snaps to integral values. We'll
+  // snap post-scaling.
+  gfx::SizeF scaled_scroll_bounds(bounds_.width() + bounds_delta_.x(),
+                                  bounds_.height() + bounds_delta_.y());
 
   float scale_factor = 1.f;
   for (LayerImpl const* current_layer = this;