Notify WebMediaPlayer when its ancestor enters/exists fullscreen.

third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 769 matching lines @@
     WebMediaPlayerClient* client) {
   WebLocalFrameImpl* webFrame =
       WebLocalFrameImpl::fromFrame(htmlMediaElement.document().frame());
 
   if (!webFrame || !webFrame->client())
     return nullptr;
 
   HTMLMediaElementEncryptedMedia& encryptedMedia =
       HTMLMediaElementEncryptedMedia::from(htmlMediaElement);
   WebString sinkId(HTMLMediaElementAudioOutputDevice::sinkId(htmlMediaElement));
-  return wrapUnique(webFrame->client()->createMediaPlayer(
-      source, client, &encryptedMedia, encryptedMedia.contentDecryptionModule(),
-      sinkId));
+  std::unique_ptr<WebMediaPlayer> mediaPlayer =
+      wrapUnique(webFrame->client()->createMediaPlayer(
+          source, client, &encryptedMedia,
+          encryptedMedia.contentDecryptionModule(), sinkId));
+
+  // Notify WebMediaPlayer: if the current media is active fullscreen element;
+  // or is a descendant of the fullscreen element and covers most of the window.
+  Element* fullscreenElement =
+      Fullscreen::currentFullScreenElementFrom(htmlMediaElement.document());
+  if (fullscreenElement == htmlMediaElement) {
+    mediaPlayer->enteredFullscreen();
+  } else if (fullscreenElement &&
+             fullscreenElement->isShadowIncludingInclusiveAncestorOf(
+                 &htmlMediaElement) &&
+             htmlMediaElement.clientWidth() >=
+                 htmlMediaElement.document().domWindow()->innerWidth() * 0.9 &&
+             htmlMediaElement.clientHeight() >=
+                 htmlMediaElement.document().domWindow()->innerHeight() * 0.9) {
+    mediaPlayer->enteredFullWindow();
+  }
+
+  return mediaPlayer;
 }
 
 ObjectContentType FrameLoaderClientImpl::getObjectContentType(
     const KURL& url,
     const String& explicitMimeType,
     bool shouldPreferPlugInsForImages) {
   // This code is based on Apple's implementation from
   // WebCoreSupport/WebFrameBridge.mm.
 
   String mimeType = explicitMimeType;
@@ skipping 188 matching lines @@
 WebDevToolsAgentImpl* FrameLoaderClientImpl::devToolsAgent() {
   return WebLocalFrameImpl::fromFrame(m_webFrame->frame()->localFrameRoot())
       ->devToolsAgentImpl();
 }
 
 KURL FrameLoaderClientImpl::overrideFlashEmbedWithHTML(const KURL& url) {
   return m_webFrame->client()->overrideFlashEmbedWithHTML(WebURL(url));
 }
 
 }  // namespace blink