Constrain the viewport & zoom when reflowing

2 files changed, 5 insertions, 1 deletions

diff --git a/components/msg/constellation_msg.rs b/components/msg/constellation_msg.rs
index 40ddb0161dd..d6a543f9b1c 100644
--- a/components/msg/constellation_msg.rs
+++ b/components/msg/constellation_msg.rs
@@ -14,6 +14,7 @@ use layers::geometry::DevicePixel;
 use util::cursor::Cursor;
 use util::geometry::{PagePx, ViewportPx};
 use std::sync::mpsc::{channel, Sender, Receiver};
+use style::viewport::ViewportConstraints;
 use webdriver_traits::WebDriverScriptCommand;
 use url::Url;
 
@@ -233,7 +234,9 @@ pub enum Msg {
     /// Requests that the constellation retrieve the current contents of the clipboard
     GetClipboardContents(Sender<String>),
     // Dispatch a webdriver command
-    WebDriverCommand(PipelineId, WebDriverScriptCommand)
+    WebDriverCommand(PipelineId, WebDriverScriptCommand),
+    /// Notifies the constellation that the viewport has been constrained in some manner
+    ViewportConstrained(PipelineId, ViewportConstraints),
 }
 
 // https://developer.mozilla.org/en-US/docs/Web/API/Using_the_Browser_API#Events
diff --git a/components/msg/lib.rs b/components/msg/lib.rs
index fc125583e95..558ccf55a96 100644
--- a/components/msg/lib.rs
+++ b/components/msg/lib.rs
@@ -9,6 +9,7 @@ extern crate hyper;
 extern crate layers;
 extern crate util;
 extern crate url;
+extern crate style;
 extern crate webdriver_traits;
 
 #[cfg(target_os="macos")]