cc: Force an update on tile size after viewport resize

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 93d658159516549e0164c2e55790fea982a05370..da042ff2c72406310544b761be54e7f12ee12123 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -568,6 +568,17 @@ void PictureLayerImpl::UpdateCanUseLCDTextAfterCommit() {
   DCHECK(!RasterSourceUsesLCDText());
 }
 
+void PictureLayerImpl::UpdateViewportAfterCommit() {
+  // When we are using GPU rasterization, the tiling texture size is dependant
+  // on the viewport size. Here we update the raster source, which in turn
+  // updates the tiling texture size.
+  DCHECK(layer_tree_impl()->IsPendingTree());

[enne (OOO), 2015/03/19 17:55:24]

IsSyncTree.  Please make sure you have a commit to active test for this.

[danakj, 2015/03/19 18:43:38]

(Any single thread LayerTreeTest would)

+  DCHECK(layer_tree_impl()->use_gpu_rasterization());
+  tilings_->UpdateTilingsToCurrentRasterSource(
+      raster_source_, nullptr, invalidation_, MinimumContentsScale(),
+      MaximumContentsScale());
+}
+
 bool PictureLayerImpl::RasterSourceUsesLCDText() const {
   return raster_source_ ? raster_source_->CanUseLCDText()
                         : layer_tree_impl()->settings().can_use_lcd_text;