2D Canvas doesn't blend video with the destination buffer.

media/filters/skcanvas_video_renderer.cc

Index: media/filters/skcanvas_video_renderer.cc
diff --git a/media/filters/skcanvas_video_renderer.cc b/media/filters/skcanvas_video_renderer.cc
index fe1bfde044ec91a71ac05b5b88b210189d8483e2..003c1951a9b4010e93e612a347d645b22aa3f66a 100644
--- a/media/filters/skcanvas_video_renderer.cc
+++ b/media/filters/skcanvas_video_renderer.cc
@@ -190,6 +190,7 @@ void SkCanvasVideoRenderer::Paint(media::VideoFrame* video_frame,
                                   SkCanvas* canvas,
                                   const gfx::RectF& dest_rect,
                                   uint8 alpha,
+                                  SkXfermode::Mode mode,
                                   VideoRotation video_rotation) {
   if (alpha == 0) {
     return;
@@ -233,13 +234,21 @@ void SkCanvasVideoRenderer::Paint(media::VideoFrame* video_frame,
     last_frame_timestamp_ = video_frame->timestamp();
   }
 
-  // Use SRC mode so we completely overwrite the buffer (in case we have alpha)
-  // this means we don't need the extra cost of clearing the buffer first.
-  paint.setXfermode(SkXfermode::Create(SkXfermode::kSrc_Mode));
+  paint.setXfermodeMode(mode);
 
   // Paint using |last_frame_|.
   paint.setFilterLevel(SkPaint::kLow_FilterLevel);
   canvas->drawBitmapRect(last_frame_, NULL, dest, &paint);
 }
 
+void SkCanvasVideoRenderer::Copy(media::VideoFrame* video_frame,
+                                 SkCanvas* canvas) {
+  Paint(video_frame,
+        canvas,
+        video_frame->visible_rect(),
+        0xff,
+        SkXfermode::kSrc_Mode,
+        media::VIDEO_ROTATION_0);
+}
+
 }  // namespace media