Plumb overlay processing into DirectRenderer.

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index 89b1e00554a01a3e2eed1ac300305bae578e7be0..67d02a434f3bcd2c6cd781e6a286ed3d3087ef30 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -258,6 +258,8 @@ GLRenderer::~GLRenderer() {
     pending_async_read_pixels_.pop_back();
   }
 
+  in_use_overlay_resources_.clear();
+
   CleanupSharedObjects();
 }
 
@@ -2000,6 +2002,8 @@ void GLRenderer::FinishDrawingFrame(DrawingFrame* frame) {
 
   GLC(gl_, gl_->Disable(GL_BLEND));
   blend_shadow_ = false;
+
+  ScheduleOverlays(frame);
 }
 
 void GLRenderer::FinishDrawingQuadList() { FlushTextureQuadCache(); }
@@ -2171,6 +2175,11 @@ void GLRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
   }
   output_surface_->SwapBuffers(&compositor_frame);
 
+  // Release previously used overlay resources and hold onto the pending ones
+  // until the next swap buffers.
+  in_use_overlay_resources_.clear();
+  in_use_overlay_resources_.swap(pending_overlay_resources_);
+
   swap_buffer_rect_ = gfx::Rect();
 
   // We don't have real fences, so we mark read fences as passed
@@ -3047,4 +3056,30 @@ bool GLRenderer::IsContextLost() {
   return output_surface_->context_provider()->IsContextLost();
 }
 
+void GLRenderer::ScheduleOverlays(DrawingFrame* frame) {
+  if (!frame->overlay_list.size())
+    return;
+
+  ResourceProvider::ResourceIdArray resources;
+  OverlayCandidateList& overlays = frame->overlay_list;
+  OverlayCandidateList::iterator it;
+  for (it = overlays.begin(); it != overlays.end(); ++it) {
+    const OverlayCandidate& overlay = *it;
+    // Skip primary plane.
+    if (overlay.plane_z_order == 0)
+      continue;
+
+    pending_overlay_resources_.push_back(
+        make_scoped_ptr(new ResourceProvider::ScopedExportLock(
+            resource_provider(), overlay.resource_id)));
+
+    context_support_->ScheduleOverlayPlane(
+        overlay.plane_z_order,
+        overlay.transform,
+        pending_overlay_resources_.back()->GetMailbox(),
+        overlay.display_rect,
+        overlay.uv_rect);
+  }
+}
+
 }  // namespace cc