Media Remoting: Add interstitial elements to media element shadow dom.

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index d47769d14bf154d0ffefddded40d5b40f2ba60f8..3d226854c8f5d3244ad70c409ec655b2673cf6a7 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -57,6 +57,7 @@
 #include "core/html/MediaFragmentURIParser.h"
 #include "core/html/TimeRanges.h"
 #include "core/html/shadow/MediaControls.h"
+#include "core/html/shadow/MediaRemotingInterstitial.h"
 #include "core/html/track/AudioTrack.h"
 #include "core/html/track/AudioTrackList.h"
 #include "core/html/track/AutomaticTrackSelection.h"
@@ -466,6 +467,7 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName,
       m_playingRemotely(false),
       m_inOverlayFullscreenVideo(false),
       m_mostlyFillingViewport(false),
+      m_mediaRemotingDisabled(false),
       m_audioTracks(this, AudioTrackList::create(*this)),
       m_videoTracks(this, VideoTrackList::create(*this)),
       m_textTracks(this, nullptr),
@@ -475,6 +477,7 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName,
       m_autoplayVisibilityObserver(nullptr),
       m_mediaControls(nullptr),
       m_controlsList(HTMLMediaElementControlsList::create(this)),
+      m_remotingInterstitial(nullptr),
       m_isPersistentVideo(false) {
   BLINK_MEDIA_LOG << "HTMLMediaElement(" << (void*)this << ")";
 
@@ -624,7 +627,7 @@ void HTMLMediaElement::parseAttribute(
     // Please see: https://w3c.github.io/remote-playback
     UseCounter::count(document(), UseCounter::DisableRemotePlaybackAttribute);
     if (params.oldValue != params.newValue) {
-      if (m_webMediaPlayer) {
+      if (m_webMediaPlayer && !m_mediaRemotingDisabled) {
         m_webMediaPlayer->requestRemotePlaybackDisabled(
             !params.newValue.isNull());
       }
@@ -3611,27 +3614,27 @@ bool HTMLMediaElement::textTracksVisible() const {
   return m_textTracksVisible;
 }
 
-static void assertShadowRootChildren(ShadowRoot& shadowRoot) {
+static void assertShadowRootChildren(ShadowRoot& shadowRoot,
+                                     Node* mediaControls) {
 #if DCHECK_IS_ON()
-  // There can be up to two children, either or both of the text
-  // track container and media controls. If both are present, the
-  // text track container must be the first child.
+  // There can be up to three children: text track container, media controls,
+  // and media remoting UI. The |mediaControls| has to be the last child if
+  // present.
   unsigned numberOfChildren = shadowRoot.countChildren();
-  DCHECK_LE(numberOfChildren, 2u);
+  DCHECK_LE(numberOfChildren, 3u);
   Node* firstChild = shadowRoot.firstChild();
-  Node* lastChild = shadowRoot.lastChild();
   if (numberOfChildren == 1) {
     DCHECK(firstChild->isTextTrackContainer() || firstChild->isMediaControls());
-  } else if (numberOfChildren == 2) {
-    DCHECK(firstChild->isTextTrackContainer());
-    DCHECK(lastChild->isMediaControls());
+  } else if (mediaControls) {
+    Node* lastChild = shadowRoot.lastChild();
+    DCHECK(lastChild == mediaControls);
   }
 #endif
 }
 
 TextTrackContainer& HTMLMediaElement::ensureTextTrackContainer() {
   ShadowRoot& shadowRoot = ensureUserAgentShadowRoot();
-  assertShadowRootChildren(shadowRoot);
+  assertShadowRootChildren(shadowRoot, m_mediaControls);
 
   Node* firstChild = shadowRoot.firstChild();
   if (firstChild && firstChild->isTextTrackContainer())
@@ -3644,7 +3647,7 @@ TextTrackContainer& HTMLMediaElement::ensureTextTrackContainer() {
   // so that they are rendered behind them.
   shadowRoot.insertBefore(textTrackContainer, firstChild);
 
-  assertShadowRootChildren(shadowRoot);
+  assertShadowRootChildren(shadowRoot, m_mediaControls);
 
   return *textTrackContainer;
 }
@@ -3756,7 +3759,7 @@ void HTMLMediaElement::ensureMediaControls() {
   // The media controls should be inserted after the text track container,
   // so that they are rendered in front of captions and subtitles. This check
   // is verifying the contract.
-  assertShadowRootChildren(shadowRoot);
+  assertShadowRootChildren(shadowRoot, m_mediaControls);
 }
 
 void HTMLMediaElement::updateControlsVisibility() {
@@ -3889,6 +3892,7 @@ DEFINE_TRACE(HTMLMediaElement) {
   visitor->trace(m_autoplayVisibilityObserver);
   visitor->trace(m_mediaControls);
   visitor->trace(m_controlsList);
+  visitor->trace(m_remotingInterstitial);
   visitor->template registerWeakMembers<HTMLMediaElement,
                                         &HTMLMediaElement::clearWeakMembers>(
       this);
@@ -4247,4 +4251,34 @@ void HTMLMediaElement::viewportFillDebouncerTimerFired(TimerBase*) {
     m_webMediaPlayer->becameDominantVisibleContent(m_mostlyFillingViewport);
 }
 
+void HTMLMediaElement::mediaRemotingStarted() {
+  if (!m_remotingInterstitial) {
+    m_remotingInterstitial = new MediaRemotingInterstitial(*this);
+    ShadowRoot& shadowRoot = ensureUserAgentShadowRoot();
+    assertShadowRootChildren(shadowRoot, m_mediaControls);
+    // Ensure the default mediaControls is the last child of the |shadowRoot|.
+    Node* lastChild = shadowRoot.lastChild();
+    if (lastChild && lastChild->isMediaControls())
+      shadowRoot.insertBefore(m_remotingInterstitial, lastChild);
+    else
+      shadowRoot.appendChild(m_remotingInterstitial);
+    assertShadowRootChildren(shadowRoot, m_mediaControls);
+  }
+  if (m_remotingInterstitial)
+    m_remotingInterstitial->show();
+}
+
+void HTMLMediaElement::mediaRemotingStopped() {
+  if (m_remotingInterstitial)
+    m_remotingInterstitial->hide();
+}
+
+void HTMLMediaElement::disableMediaRemoting() {
+  if (m_webMediaPlayer)
+    m_webMediaPlayer->requestRemotePlaybackDisabled(true);
+  m_mediaRemotingDisabled = true;
+  if (m_remotingInterstitial)
+    m_remotingInterstitial->hide();
+}
+
 }  // namespace blink