Move scaling of ui resources for scrollbars to the time of upload

cc/layers/painted_scrollbar_layer.cc

Index: cc/layers/painted_scrollbar_layer.cc
diff --git a/cc/layers/painted_scrollbar_layer.cc b/cc/layers/painted_scrollbar_layer.cc
index e10947b3dc6864920a0295cdeee87bc5c4798253..aa544ea0db9004330ab01dbce0c557fc848316db 100644
--- a/cc/layers/painted_scrollbar_layer.cc
+++ b/cc/layers/painted_scrollbar_layer.cc
@@ -78,26 +78,6 @@ ScrollbarOrientation PaintedScrollbarLayer::orientation() const {
   return scrollbar_->Orientation();
 }
 
-int PaintedScrollbarLayer::MaxTextureSize() {
-  DCHECK(layer_tree_host());
-  return layer_tree_host()->GetRendererCapabilities().max_texture_size;
-}
-
-float PaintedScrollbarLayer::ClampScaleToMaxTextureSize(float scale) {
-  // If the scaled bounds() is bigger than the max texture size of the
-  // device, we need to clamp it by rescaling, since this is used
-  // below to set the texture size.
-  gfx::Size scaled_bounds = gfx::ScaleToCeiledSize(bounds(), scale);
-  if (scaled_bounds.width() > MaxTextureSize() ||
-      scaled_bounds.height() > MaxTextureSize()) {
-    if (bounds().width() > bounds().height())
-      return (MaxTextureSize() - 1) / static_cast<float>(bounds().width());
-    else
-      return (MaxTextureSize() - 1) / static_cast<float>(bounds().height());
-  }
-  return scale;
-}
-
 void PaintedScrollbarLayer::PushPropertiesTo(LayerImpl* layer) {
   Layer::PushPropertiesTo(layer);
 
@@ -202,8 +182,7 @@ void PaintedScrollbarLayer::UpdateInternalContentScale() {
     scale = std::max(transform_scales.x(), transform_scales.y());
   }
   bool changed = false;
-  changed |= UpdateProperty(ClampScaleToMaxTextureSize(scale),
-                            &internal_contents_scale_);
+  changed |= UpdateProperty(scale, &internal_contents_scale_);
   changed |=
       UpdateProperty(gfx::ScaleToCeiledSize(bounds(), internal_contents_scale_),
                      &internal_content_bounds_);