Detect change on the intersection of video and viewport.

third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp

Index: third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp b/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
index 2081e50930d46df5178f439c030e0c500b6519f8..9ed873ff64d2dfd138e47a1851ef36c9d8caf75e 100644
--- a/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
+++ b/third_party/WebKit/Source/web/FrameLoaderClientImpl.cpp
@@ -775,9 +775,16 @@ std::unique_ptr<WebMediaPlayer> FrameLoaderClientImpl::createWebMediaPlayer(
   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));
+  WebMediaPlayer::ViewportIntersectionInfo intersectInfo =

[miu, 2016/11/21 21:07:04]

It seems that this should be unconditional. Just:

  mediaPlayer->viewportIntersectionChanged(
      htmlMediaElement.currentViewportIntersection());

[xjz, 2016/11/21 23:58:42]

Done.

+      htmlMediaElement.currentViewportIntersection();
+  if (!intersectInfo.intersectRect.isEmpty())
+    mediaPlayer->videoViewportIntersectionChanged(intersectInfo);
+  return mediaPlayer;
 }
 
 WebRemotePlaybackClient* FrameLoaderClientImpl::createWebRemotePlaybackClient(