Preliminary compositor disabling patch.

cc/surfaces/surface_aggregator.cc

Index: cc/surfaces/surface_aggregator.cc
diff --git a/cc/surfaces/surface_aggregator.cc b/cc/surfaces/surface_aggregator.cc
index 21ec6dbdb3802051aabf82246c9f84aac0098f43..6557a28e6b98458bc79b053fcbb5f5ec0caa4564 100644
--- a/cc/surfaces/surface_aggregator.cc
+++ b/cc/surfaces/surface_aggregator.cc
@@ -243,7 +243,7 @@ void SurfaceAggregator::HandleSurfaceQuad(
     RenderPassId remapped_pass_id = RemapPassId(source.id, surface_id);
 
     copy_pass->SetAll(remapped_pass_id, source.output_rect, gfx::Rect(),
-                      source.transform_to_root_target,
+                      gfx::Rect(), source.transform_to_root_target,
                       source.has_transparent_background);
 
     MoveMatchingRequests(source.id, &copy_requests, &copy_pass->copy_requests);
@@ -285,6 +285,8 @@ void SurfaceAggregator::HandleSurfaceQuad(
 
     ClipData quads_clip = CalculateClipRect(clip_rect, surface_quad_clip_rect,
                                             content_to_target_transform);
+    dest_pass->overlay_rect = MathUtil::MapEnclosingClippedRect(
+        surface_quad->quadTransform(), last_pass.overlay_rect);
 
     CopyQuadsToPass(quads, last_pass.shared_quad_state_list, surface_transform,
                     quads_clip, dest_pass, surface_id);
@@ -427,7 +429,7 @@ void SurfaceAggregator::CopyPasses(const DelegatedFrameData* frame_data,
             ? gfx::Rect()
             : DamageRectForSurface(surface, source, source.output_rect);
     copy_pass->SetAll(remapped_pass_id, source.output_rect, damage_rect,
-                      source.transform_to_root_target,
+                      source.overlay_rect, source.transform_to_root_target,
                       source.has_transparent_background);
 
     CopyQuadsToPass(source.quad_list, source.shared_quad_state_list,