SetNeedsRedraw directly when updating a visible tile.

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index 5d45caed48099c77a8f232e8ac0dfe9d770e2f72..dbfa63c76cbbb84bbf0c344bfd49e85ad38dfcee 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -26,6 +26,12 @@ PictureLayer::PictureLayer(ContentLayerClient* client)
       can_use_lcd_text_last_frame_(can_use_lcd_text()) {
 }
 
+PictureLayer::PictureLayer(ContentLayerClient* client,
+                           scoped_ptr<RecordingSource> source)
+    : PictureLayer(client) {
+  recording_source_ = source.Pass();
+}
+
 PictureLayer::~PictureLayer() {
 }