3 files changed, 74 insertions, 10 deletions

diff --git a/components/script/dom/htmliframeelement.rs b/components/script/dom/htmliframeelement.rs
index 44122f07fe4..54712f44cad 100644
--- a/components/script/dom/htmliframeelement.rs
+++ b/components/script/dom/htmliframeelement.rs
@@ -11,12 +11,13 @@ use dom::bindings::codegen::Bindings::BrowserElementBinding::BrowserElementLocat
 use dom::bindings::codegen::Bindings::BrowserElementBinding::BrowserElementOpenTabEventDetail;
 use dom::bindings::codegen::Bindings::BrowserElementBinding::BrowserElementOpenWindowEventDetail;
 use dom::bindings::codegen::Bindings::BrowserElementBinding::BrowserElementSecurityChangeDetail;
+use dom::bindings::codegen::Bindings::BrowserElementBinding::BrowserElementVisibilityChangeEventDetail;
 use dom::bindings::codegen::Bindings::BrowserElementBinding::BrowserShowModalPromptEventDetail;
 use dom::bindings::codegen::Bindings::HTMLIFrameElementBinding;
 use dom::bindings::codegen::Bindings::HTMLIFrameElementBinding::HTMLIFrameElementMethods;
 use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
 use dom::bindings::conversions::ToJSValConvertible;
-use dom::bindings::error::{Error, ErrorResult};
+use dom::bindings::error::{Error, ErrorResult, Fallible};
 use dom::bindings::global::GlobalRef;
 use dom::bindings::inheritance::Castable;
 use dom::bindings::js::{Root, LayoutJS};
@@ -66,6 +67,7 @@ pub struct HTMLIFrameElement {
     subpage_id: Cell<Option<SubpageId>>,
     sandbox: Cell<Option<u8>>,
     load_blocker: DOMRefCell<Option<LoadBlocker>>,
+    visibility: Cell<bool>,
 }
 
 impl HTMLIFrameElement {
@@ -196,6 +198,7 @@ impl HTMLIFrameElement {
             subpage_id: Cell::new(None),
             sandbox: Cell::new(None),
             load_blocker: DOMRefCell::new(None),
+            visibility: Cell::new(true),
         }
     }
 
@@ -221,6 +224,26 @@ impl HTMLIFrameElement {
         self.pipeline_id.get()
     }
 
+    pub fn change_visibility_status(&self, visibility: bool) {
+        if self.visibility.get() != visibility {
+            self.visibility.set(visibility);
+
+            // Visibility changes are only exposed to Mozbrowser iframes
+            if self.Mozbrowser() {
+                self.dispatch_mozbrowser_event(MozBrowserEvent::VisibilityChange(visibility));
+            }
+        }
+    }
+
+    pub fn set_visible(&self, visible: bool) {
+        if let Some(pipeline_id) = self.pipeline_id.get() {
+            let window = window_from_node(self);
+            let window = window.r();
+            let msg = ConstellationMsg::SetVisible(pipeline_id, visible);
+            window.constellation_chan().send(msg).unwrap();
+        }
+    }
+
     /// https://html.spec.whatwg.org/multipage/#iframe-load-event-steps steps 1-4
     pub fn iframe_load_event_steps(&self, loaded_pipeline: PipelineId) {
         // TODO(#9592): assert that the load blocker is present at all times when we
@@ -387,6 +410,11 @@ impl MozBrowserEventDetailBuilder for HTMLIFrameElement {
                     returnValue: Some(DOMString::from(return_value)),
                 }.to_jsval(cx, rval)
             }
+            MozBrowserEvent::VisibilityChange(visibility) => {
+                BrowserElementVisibilityChangeEventDetail {
+                    visible: Some(visibility),
+                }.to_jsval(cx, rval);
+            }
         }
     }
 }
@@ -498,6 +526,30 @@ impl HTMLIFrameElementMethods for HTMLIFrameElement {
         }
     }
 
+    // https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/setVisible
+    fn SetVisible(&self, visible: bool) -> ErrorResult {
+        if self.Mozbrowser() {
+            self.set_visible(visible);
+            Ok(())
+        } else {
+            debug!("this frame is not mozbrowser: mozbrowser attribute missing, or not a top
+                level window, or mozbrowser preference not set (use --pref dom.mozbrowser.enabled)");
+            Err(Error::NotSupported)
+        }
+    }
+
+    // https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/getVisible
+    fn GetVisible(&self) -> Fallible<bool> {
+        if self.Mozbrowser() {
+            Ok(self.visibility.get())
+        } else {
+            debug!("this frame is not mozbrowser: mozbrowser attribute missing, or not a top
+                level window, or mozbrowser preference not set (use --pref dom.mozbrowser.enabled)");
+            Err(Error::NotSupported)
+        }
+    }
+
+
     // https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/stop
     fn Stop(&self) -> ErrorResult {
         Err(Error::NotSupported)
diff --git a/components/script/dom/webidls/BrowserElement.webidl b/components/script/dom/webidls/BrowserElement.webidl
index 9351cc9377a..f183b5cf813 100644
--- a/components/script/dom/webidls/BrowserElement.webidl
+++ b/components/script/dom/webidls/BrowserElement.webidl
@@ -96,20 +96,24 @@ dictionary BrowserElementOpenWindowEventDetail {
   // Element frameElement;
 };
 
+dictionary BrowserElementVisibilityChangeEventDetail {
+  boolean visible;
+};
+
 BrowserElement implements BrowserElementCommon;
 BrowserElement implements BrowserElementPrivileged;
 
 [NoInterfaceObject]
 interface BrowserElementCommon {
-  //[Throws,
-  // Pref="dom.mozBrowserFramesEnabled",
-  // CheckAnyPermissions="browser embed-widgets"]
-  //void setVisible(boolean visible);
-
-  //[Throws,
-  // Pref="dom.mozBrowserFramesEnabled",
-  // CheckAnyPermissions="browser embed-widgets"]
-  //DOMRequest getVisible();
+  [Throws,
+   Pref="dom.mozbrowser.enabled",
+   CheckAnyPermissions="browser embed-widgets"]
+  void setVisible(boolean visible);
+
+  [Throws,
+   Pref="dom.mozbrowser.enabled",
+   CheckAnyPermissions="browser embed-widgets"]
+  boolean getVisible();
 
   //[Throws,
   // Pref="dom.mozBrowserFramesEnabled",
diff --git a/components/script/dom/window.rs b/components/script/dom/window.rs
index 4bfbb1993d1..b778b37abd7 100644
--- a/components/script/dom/window.rs
+++ b/components/script/dom/window.rs
@@ -1477,6 +1477,14 @@ impl Window {
         self.timers.suspend();
     }
 
+    pub fn slow_down_timers(&self) {
+        self.timers.slow_down();
+    }
+
+    pub fn speed_up_timers(&self) {
+        self.timers.speed_up();
+    }
+
     pub fn need_emit_timeline_marker(&self, timeline_type: TimelineMarkerType) -> bool {
         let markers = self.devtools_markers.borrow();
         markers.contains(&timeline_type)