Let the WebMediaPlayer decide whether to use overlay video.

Source/core/html/HTMLVideoElement.cpp

Index: Source/core/html/HTMLVideoElement.cpp
diff --git a/Source/core/html/HTMLVideoElement.cpp b/Source/core/html/HTMLVideoElement.cpp
index 1fd3884597140f252920d6f5e0924fb1c446b25a..db2387f1e9c67b964f248a2c7eb86861ed589bc3 100644
--- a/Source/core/html/HTMLVideoElement.cpp
+++ b/Source/core/html/HTMLVideoElement.cpp
@@ -38,6 +38,7 @@
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/layout/LayoutImage.h"
 #include "core/layout/LayoutVideo.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
@@ -244,6 +245,20 @@ bool HTMLVideoElement::webkitDisplayingFullscreen()
     return isFullscreen();
 }
 
+bool HTMLVideoElement::usesOverlayFullscreenVideo() const
+{
+    if (RuntimeEnabledFeatures::forceOverlayFullscreenVideoEnabled())
+        return true;
+
+    // TODO(watk): Remove this and the REF check below when the chromium side change to not
+    // set OverlayFullscreenVideo on Android lands. http://crbug.com/511376
+    if (HTMLMediaElement::isMediaStreamURL(sourceURL().string()))
+        return false;
+
+    return RuntimeEnabledFeatures::overlayFullscreenVideoEnabled()
+        || (webMediaPlayer() && webMediaPlayer()->supportsOverlayFullscreenVideo());
+}
+
 void HTMLVideoElement::didMoveToNewDocument(Document& oldDocument)
 {
     if (m_imageLoader)