cc: Async readback.

cc/quads/render_pass_unittest.cc

Index: cc/quads/render_pass_unittest.cc
diff --git a/cc/quads/render_pass_unittest.cc b/cc/quads/render_pass_unittest.cc
index f2271b59192a531140c5a86f5afc8ecddd6a2753..9ab0123d2619c61643e1dd10f90e776d4602bcb5 100644
--- a/cc/quads/render_pass_unittest.cc
+++ b/cc/quads/render_pass_unittest.cc
@@ -29,6 +29,7 @@ struct RenderPassSize {
   gfx::RectF damage_rect;
   bool has_transparent_background;
   bool has_occlusion_from_outside_target_surface;
+  std::vector<RenderPass::RequestCopyAsBitmapCallback> copy_callbacks;
 };
 
 TEST(RenderPassTest, CopyShouldBeIdenticalExceptIdAndQuads) {
@@ -47,6 +48,7 @@ TEST(RenderPassTest, CopyShouldBeIdenticalExceptIdAndQuads) {
                transform_to_root,
                has_transparent_background,
                has_occlusion_from_outside_target_surface);
+  pass->copy_callbacks.push_back(RenderPass::RequestCopyAsBitmapCallback());
 
   // Stick a quad in the pass, this should not get copied.
   scoped_ptr<SharedQuadState> shared_state = SharedQuadState::Create();
@@ -72,6 +74,9 @@ TEST(RenderPassTest, CopyShouldBeIdenticalExceptIdAndQuads) {
             copy->has_occlusion_from_outside_target_surface);
   EXPECT_EQ(0u, copy->quad_list.size());
 
+  // The copy callback should not be copied/duplicated.
+  EXPECT_EQ(0u, copy->copy_callbacks.size());
+
   EXPECT_EQ(sizeof(RenderPassSize), sizeof(RenderPass));
 }