Let AreVisibleResourcesReady return correct value for PictureImageLayerImpl

cc/layers/picture_image_layer_impl.cc

Index: cc/layers/picture_image_layer_impl.cc
diff --git a/cc/layers/picture_image_layer_impl.cc b/cc/layers/picture_image_layer_impl.cc
index 9c478f0f9a10e01ed72813e3a6a4cd567040c7f6..b82e9b2037f2ce3fb756776ada24d7af335f1118 100644
--- a/cc/layers/picture_image_layer_impl.cc
+++ b/cc/layers/picture_image_layer_impl.cc
@@ -31,15 +31,17 @@ void PictureImageLayerImpl::GetDebugBorderProperties(
   *width = DebugColors::ImageLayerBorderWidth(layer_tree_impl());
 }
 
+bool PictureImageLayerImpl::ShouldAdjustRasterSourceScale() const {
+  return false;
+}
+
 void PictureImageLayerImpl::CalculateRasterContentsScale(
-    bool animating_transform_to_screen,
-    float* raster_contents_scale,
-    float* low_res_raster_contents_scale) {
+    bool animating_transform_to_screen) {
   // Don't scale images during rastering to ensure image quality, save memory
   // and avoid frequent re-rastering on change of scale.
-  *raster_contents_scale = std::max(1.f, MinimumContentsScale());
+  raster_contents_scale_ = std::max(1.f, MinimumContentsScale());
   // We don't need low res tiles.
-  *low_res_raster_contents_scale = *raster_contents_scale;
+  low_res_raster_contents_scale_ = raster_contents_scale_;
 }
 
 }  // namespace cc