Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 028aa9b35ed8580fe85aa7bde558117300d66be9..0a759e7aec99cfdb29b8d27b96687520b87e1ac1 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -601,6 +601,35 @@ void RenderWidgetHostImpl::CopyFromBackingStore(
   callback.Run(result, output.GetBitmap());
 }
 
+bool RenderWidgetHostImpl::CanCopyToVideoFrame() const {
+#if !defined(OS_WIN)
+  return false;
+#else
+  return view_ && is_accelerated_compositing_active_;
+#endif
+}
+
+void RenderWidgetHostImpl::CopyFromBackingStoreToVideoFrame(
+    const gfx::Rect& src_subrect,
+    const gfx::Size& dst_size,
+    const base::Callback<void(media::VideoFrame*)>& callback) {
+#if defined(OS_WIN)
+  if (view_ && is_accelerated_compositing_active_) {
+    TRACE_EVENT0("browser",
+        "RenderWidgetHostImpl::CopyFromBackingStoreToVideoFrame");
+    gfx::Rect copy_rect = src_subrect.IsEmpty() ?
+        gfx::Rect(view_->GetViewBounds().size()) : src_subrect;
+    view_->CopyFromCompositingSurfaceToVideoFrame(copy_rect,
+                                                  dst_size,
+                                                  callback);
+    return;
+  }
+
+  NOTREACHED() << "CopyFromBackingStoreToVideoFrame() called when not possible";
+#endif
+  callback.Run(media::VideoFrame::CreateEmptyFrame());
+}
+
 #if defined(TOOLKIT_GTK)
 bool RenderWidgetHostImpl::CopyFromBackingStoreToGtkWindow(
     const gfx::Rect& dest_rect, GdkWindow* target) {