[SPv2] Use foreign layer support to enable composited video.

third_party/WebKit/Source/core/paint/VideoPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/VideoPainter.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/layout/LayoutVideo.h"
 #include "core/paint/ImagePainter.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/paint/ClipRecorder.h"
+#include "platform/graphics/paint/ForeignLayerDisplayItem.h"
 
 namespace blink {
 
 void VideoPainter::paintReplaced(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     WebMediaPlayer* mediaPlayer = m_layoutVideo.mediaElement()->webMediaPlayer();
     bool displayingPoster = m_layoutVideo.videoElement()->shouldDisplayPosterImage();
     if (!displayingPoster && !mediaPlayer)
         return;
 
     LayoutRect rect(m_layoutVideo.videoBox());
     if (rect.isEmpty())
         return;
     rect.moveBy(paintOffset);
 
     GraphicsContext& context = paintInfo.context;
     LayoutRect contentRect = m_layoutVideo.contentBoxRect();
     contentRect.moveBy(paintOffset);
 
     Optional<ClipRecorder> clipRecorder;
     if (!contentRect.contains(rect))
         clipRecorder.emplace(context, m_layoutVideo, paintInfo.displayItemTypeForClipping(), pixelSnappedIntRect(contentRect));
 
     if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(context, m_layoutVideo, paintInfo.phase))
         return;
 
-    LayoutObjectDrawingRecorder drawingRecorder(context, m_layoutVideo, paintInfo.phase, contentRect);
 
     // Video frames are only painted in software for printing or capturing node images via web APIs.
     bool forceSoftwareVideoPaint = paintInfo.getGlobalPaintFlags() & GlobalPaintFlattenCompositingLayers;
 
+    bool paintWithForeignLayer =
+        !displayingPoster && !forceSoftwareVideoPaint
+        && RuntimeEnabledFeatures::slimmingPaintV2Enabled();
+    if (paintWithForeignLayer) {
+        if (WebLayer* layer = m_layoutVideo.mediaElement()->platformLayer()) {
+            IntRect pixelSnappedRect = pixelSnappedIntRect(contentRect);
+            recordForeignLayer(

[pdr., 2016/07/06 23:30:37]

Wdyt about changing recordForeignLayer to take an IntRect? The other caller in
WebPluginContainerImpl could then pass in frameRect() instead of location() and
size().

+                context, m_layoutVideo, DisplayItem::ForeignLayerVideo, layer,
+                pixelSnappedRect.location(), pixelSnappedRect.size());
+            return;
+        }
+    }
+
+    LayoutObjectDrawingRecorder drawingRecorder(context, m_layoutVideo, paintInfo.phase, contentRect);
+
     if (displayingPoster || !forceSoftwareVideoPaint) {
         // This will display the poster image, if one is present, and otherwise paint nothing.
         ImagePainter(m_layoutVideo).paintIntoRect(context, rect);
     } else {
         SkPaint videoPaint = context.fillPaint();
         videoPaint.setColor(SK_ColorBLACK);
         m_layoutVideo.videoElement()->paintCurrentFrame(context.canvas(), pixelSnappedIntRect(rect), &videoPaint);
     }
 }
 
 } // namespace blink