cc: Refactor content scale/bounds into draw properties

cc/scrollbar_layer.cc

Index: cc/scrollbar_layer.cc
diff --git a/cc/scrollbar_layer.cc b/cc/scrollbar_layer.cc
index 8ebfc89346eba2fa07507f04f4474df47e5a0ff4..97175555ad46f1d91cbfdd57b2c9ccb14fc0b2bf 100644
--- a/cc/scrollbar_layer.cc
+++ b/cc/scrollbar_layer.cc
@@ -68,9 +68,10 @@ float ScrollbarLayer::clampScaleToMaxTextureSize(float scale) {
     return scale;
 }
 
-void ScrollbarLayer::setContentsScale(float contentsScale) {
-    contentsScale = clampScaleToMaxTextureSize(contentsScale);
-    ContentsScalingLayer::setContentsScale(contentsScale);
+void ScrollbarLayer::updateContentsScale(float scale)
+{
+    float contentsScale = clampScaleToMaxTextureSize(scale);
+    ContentsScalingLayer::updateContentsScale(contentsScale);
     DCHECK_LE(contentBounds().width(), maxTextureSize());
     DCHECK_LE(contentBounds().height(), maxTextureSize());
 }