WIP - WebMediaPlayer switch media renderer.

third_party/WebKit/Source/web/FullscreenController.cpp

Index: third_party/WebKit/Source/web/FullscreenController.cpp
diff --git a/third_party/WebKit/Source/web/FullscreenController.cpp b/third_party/WebKit/Source/web/FullscreenController.cpp
index 3d30b85fd62502e88d3945bb4ada075ecc7bd6cf..281ae216e956ba2dcbecbac83c5eb158f53b4e6e 100644
--- a/third_party/WebKit/Source/web/FullscreenController.cpp
+++ b/third_party/WebKit/Source/web/FullscreenController.cpp
@@ -41,6 +41,7 @@
 #include "platform/RuntimeEnabledFeatures.h"
 #include "public/platform/WebLayerTreeView.h"
 #include "public/web/WebFrameClient.h"
+#include "third_party/WebKit/Source/core/dom/TagCollection.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebSettingsImpl.h"
 #include "web/WebViewImpl.h"
@@ -89,6 +90,12 @@ void FullscreenController::didEnterFullscreen()
         HTMLVideoElement* videoElement = toHTMLVideoElement(element);
         if (videoElement->usesOverlayFullscreenVideo() && m_webViewImpl->layerTreeView())
             m_webViewImpl->layerTreeView()->setHasTransparentBackground(true);
+    } else {
+        // Notify all the video descendants that an ancestor enters full screen.
+        for (HTMLVideoElement& videoElement : Traversal<HTMLVideoElement>::descendantsOf(*element)) {
+            if (videoElement.webMediaPlayer())
+                videoElement.webMediaPlayer()->ancestorEnteredFullscreen();
+        }
     }
 }
 
@@ -121,6 +128,13 @@ void FullscreenController::didExitFullscreen()
                     m_needsScrollAndScaleRestore = true;
 
                 fullscreen->didExitFullscreen();
+                if (!isHTMLVideoElement(element)) {
+                    // Notify all the video descendants that an anecestor exits full screen.
+                    for (HTMLVideoElement& videoElement : Traversal<HTMLVideoElement>::descendantsOf(*element)) {
+                        if (videoElement.webMediaPlayer())
+                            videoElement.webMediaPlayer()->ancestorExitedFullscreen();
+                    }
+                }
             }
         }
     }