cc: Add CopyAsBitmapRequest class to hold the readback callback.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
@@ skipping 585 matching lines @@
       LayerIteratorType::End(frame->render_surface_layer_list);
   for (LayerIteratorType it =
            LayerIteratorType::Begin(frame->render_surface_layer_list);
        it != end;
        ++it) {
     RenderPass::Id target_render_pass_id =
         it.target_render_surface_layer()->render_surface()->RenderPassId();
     RenderPass* target_render_pass =
         frame->render_passes_by_id[target_render_pass_id];
 
-    bool prevent_occlusion =
-        it.target_render_surface_layer()->HasRequestCopyCallback();
+    bool prevent_occlusion = it.target_render_surface_layer()->HasCopyRequest();
     occlusion_tracker.EnterLayer(it, prevent_occlusion);
 
     AppendQuadsData append_quads_data(target_render_pass->id);
     if (output_surface_->ForcedDrawToSoftwareDevice())
       append_quads_data.allow_tile_draw_quads = false;
 
     if (it.represents_target_render_surface()) {
-      if (it->HasRequestCopyCallback()) {
+      if (it->HasCopyRequest()) {
         have_copy_request = true;
-        it->TakeRequestCopyCallbacks(&target_render_pass->copy_callbacks);
+        it->TakeCopyRequests(&target_render_pass->copy_requests);
       }
     } else if (it.represents_contributing_render_surface()) {
       RenderPass::Id contributing_render_pass_id =
           it->render_surface()->RenderPassId();
       RenderPass* contributing_render_pass =
           frame->render_passes_by_id[contributing_render_pass_id];
       AppendQuadsForRenderSurfaceLayer(target_render_pass,
                                        *it,
                                        contributing_render_pass,
                                        occlusion_tracker,
@@ skipping 1606 matching lines @@
 }
 
 void LayerTreeHostImpl::SetDebugState(const LayerTreeDebugState& debug_state) {
   if (debug_state_.continuous_painting != debug_state.continuous_painting)
     paint_time_counter_->ClearHistory();
 
   debug_state_ = debug_state;
 }
 
 }  // namespace cc