Webkit setting for embedders that do not support fullscreen.

Source/web/FullscreenController.cpp

Index: Source/web/FullscreenController.cpp
diff --git a/Source/web/FullscreenController.cpp b/Source/web/FullscreenController.cpp
index 6c1aa5fe4a9e3dca85325a4b3473fe0b7566513e..e45046097fbbd38aa33cdbca86658406a88d5bda 100644
--- a/Source/web/FullscreenController.cpp
+++ b/Source/web/FullscreenController.cpp
@@ -153,6 +153,13 @@ void FullscreenController::didExitFullScreen()
     m_fullScreenFrame.clear();
 }
 
+bool FullscreenController::fullscreenEnabled(blink::Element*)
+{
+    // TODO(igsolla): add check for disallowFullscreenForNonMediaElements here once
+    // https://codereview.chromium.org/416013002/ is reverted.
+    return m_webViewImpl->settingsImpl()->fullscreenEnabled();
+}
+
 void FullscreenController::enterFullScreenForElement(blink::Element* element)
 {
     // We are already transitioning to fullscreen for a different element.