Implement media cast buttons

Source/core/html/shadow/MediaControls.cpp

Index: Source/core/html/shadow/MediaControls.cpp
diff --git a/Source/core/html/shadow/MediaControls.cpp b/Source/core/html/shadow/MediaControls.cpp
index 96a6062a30494d1a8c3ab46fa5a37bf7bc650edf..97ed161e97433da35dd5e1cd77f8b4b86c2cc31f 100644
--- a/Source/core/html/shadow/MediaControls.cpp
+++ b/Source/core/html/shadow/MediaControls.cpp
@@ -59,6 +59,8 @@ MediaControls::MediaControls(HTMLMediaElement& mediaElement)
     , m_volumeSlider(nullptr)
     , m_toggleClosedCaptionsButton(nullptr)
     , m_fullScreenButton(nullptr)
+    , m_castButton(nullptr)
+    , m_overlayCastButton(nullptr)
     , m_durationDisplay(nullptr)
     , m_enclosure(nullptr)
     , m_hideMediaControlsTimer(this, &MediaControls::hideMediaControlsTimerFired)
@@ -82,20 +84,27 @@ bool MediaControls::initializeControls()
 {
     TrackExceptionState exceptionState;
 
+    RefPtrWillBeRawPtr<MediaControlOverlayEnclosureElement> overlayEnclosure = MediaControlOverlayEnclosureElement::create(*this);
+
     if (document().settings() && document().settings()->mediaControlsOverlayPlayButtonEnabled()) {
-        RefPtrWillBeRawPtr<MediaControlOverlayEnclosureElement> overlayEnclosure = MediaControlOverlayEnclosureElement::create(*this);
         RefPtrWillBeRawPtr<MediaControlOverlayPlayButtonElement> overlayPlayButton = MediaControlOverlayPlayButtonElement::create(*this);
         m_overlayPlayButton = overlayPlayButton.get();
         overlayEnclosure->appendChild(overlayPlayButton.release(), exceptionState);
         if (exceptionState.hadException())
             return false;
-
-        m_overlayEnclosure = overlayEnclosure.get();
-        appendChild(overlayEnclosure.release(), exceptionState);
-        if (exceptionState.hadException())
-            return false;
     }
 
+    RefPtrWillBeRawPtr<MediaControlCastButtonElement> overlayCastButton = MediaControlCastButtonElement::create(*this, true);
+    m_overlayCastButton = overlayCastButton.get();
+    overlayEnclosure->appendChild(overlayCastButton.release(), exceptionState);
+    if (exceptionState.hadException())
+        return false;
+
+    m_overlayEnclosure = overlayEnclosure.get();
+    appendChild(overlayEnclosure.release(), exceptionState);
+    if (exceptionState.hadException())
+        return false;
+
     // Create an enclosing element for the panel so we can visually offset the controls correctly.
     RefPtrWillBeRawPtr<MediaControlPanelEnclosureElement> enclosure = MediaControlPanelEnclosureElement::create(*this);
 
@@ -144,6 +153,12 @@ bool MediaControls::initializeControls()
     if (exceptionState.hadException())
         return false;
 
+    RefPtrWillBeRawPtr<MediaControlCastButtonElement> castButton = MediaControlCastButtonElement::create(*this, false);
+    m_castButton = castButton.get();
+    panel->appendChild(castButton.release(), exceptionState);
+    if (exceptionState.hadException())
+        return false;
+
     RefPtrWillBeRawPtr<MediaControlFullscreenButtonElement> fullscreenButton = MediaControlFullscreenButtonElement::create(*this);
     m_fullScreenButton = fullscreenButton.get();
     panel->appendChild(fullscreenButton.release(), exceptionState);
@@ -189,6 +204,7 @@ void MediaControls::reset()
     else
         m_fullScreenButton->hide();
 
+    refreshCastButtonVisibility();
     makeOpaque();
 }
 
@@ -204,7 +220,7 @@ void MediaControls::show()
 void MediaControls::mediaElementFocused()
 {
     show();
-    stopHideMediaControlsTimer();
+    resetHideMediaControlsTimer();
 }
 
 void MediaControls::hide()
@@ -351,6 +367,32 @@ void MediaControls::textTracksChanged()
     refreshClosedCaptionsButtonVisibility();
 }
 
+void MediaControls::refreshCastButtonVisibility()
+{
+    if (mediaElement().hasRemoteRoutes()) {
+        // The reason for the autoplay test is that some pages (e.g. vimeo.com) have an autoplay background video, which
+        // doesn't autoplay on Chrome for Android (we prevent it) so starts paused. In such cases we don't want to automatically
+        // show the cast button, since it looks strange and is unlikely to correspond with anything the user wants to do.
+        // If a user does want to cast a paused autoplay video then they can still do so by touching or clicking on the
+        // video, which will cause the cast button to appear.
+        if (!mediaElement().shouldShowControls() && !mediaElement().autoplay() && mediaElement().paused()) {
+            showOverlayCastButton();
+        } else if (mediaElement().shouldShowControls()) {
+            m_overlayCastButton->hide();
+            m_castButton->show();
+        }
+    } else {
+        m_castButton->hide();
+        m_overlayCastButton->hide();
+    }
+}
+
+void MediaControls::showOverlayCastButton()
+{
+    m_overlayCastButton->show();
+    resetHideMediaControlsTimer();
+}
+
 void MediaControls::enteredFullscreen()
 {
     m_fullScreenButton->setIsFullscreen(true);
@@ -365,6 +407,18 @@ void MediaControls::exitedFullscreen()
     startHideMediaControlsTimer();
 }
 
+void MediaControls::startedCasting()
+{
+    m_castButton->setIsPlayingRemotely(true);
+    m_overlayCastButton->setIsPlayingRemotely(true);
+}
+
+void MediaControls::stoppedCasting()
+{
+    m_castButton->setIsPlayingRemotely(false);
+    m_overlayCastButton->setIsPlayingRemotely(false);
+}
+
 void MediaControls::defaultEventHandler(Event* event)
 {
     HTMLDivElement::defaultEventHandler(event);
@@ -414,6 +468,7 @@ void MediaControls::hideMediaControlsTimerFired(Timer<MediaControls>*)
         return;
 
     makeTransparent();
+    m_overlayCastButton->hide();
 }
 
 void MediaControls::startHideMediaControlsTimer()
@@ -426,6 +481,14 @@ void MediaControls::stopHideMediaControlsTimer()
     m_hideMediaControlsTimer.stop();
 }
 
+void MediaControls::resetHideMediaControlsTimer()
+{
+    stopHideMediaControlsTimer();
+    if (!mediaElement().paused())
+        startHideMediaControlsTimer();
+}
+
+
 const AtomicString& MediaControls::shadowPseudoId() const
 {
     DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls"));
@@ -451,10 +514,10 @@ void MediaControls::createTextTrackDisplay()
     m_textDisplayContainer = textDisplayContainer.get();
 
     // Insert it before (behind) all other control elements.
-    if (m_overlayEnclosure && m_overlayPlayButton)
+    if (m_overlayPlayButton)
         m_overlayEnclosure->insertBefore(textDisplayContainer.release(), m_overlayPlayButton);
     else
-        insertBefore(textDisplayContainer.release(), m_enclosure);
+        m_overlayEnclosure->insertBefore(textDisplayContainer.release(), m_overlayCastButton);
 }
 
 void MediaControls::showTextTrackDisplay()
@@ -495,6 +558,8 @@ void MediaControls::trace(Visitor* visitor)
     visitor->trace(m_fullScreenButton);
     visitor->trace(m_durationDisplay);
     visitor->trace(m_enclosure);
+    visitor->trace(m_castButton);
+    visitor->trace(m_overlayCastButton);
     HTMLDivElement::trace(visitor);
 }