Turn off computation of the interest rect in cc in synchronized paint mode.

cc/trees/layer_tree_host_unittest_scroll.cc

 // Copyright 2012 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.h"
 
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 492 matching lines @@
       expected_no_scroll_layer_ = root_scroll_layer_;
     } else {
       expected_scroll_layer_ = root_scroll_layer_;
       expected_no_scroll_layer_ = child_layer_;
     }
 
     expected_scroll_layer_->SetScrollOffset(initial_offset_);
 
     layer_tree_host()->SetRootLayer(root_layer);
     LayerTreeTest::SetupTree();
+    fake_content_layer_client_.set_bounds(root_layer->bounds());
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void WillCommit() override {
     // Keep the test committing (otherwise the early out for no update
     // will stall the test).
     if (layer_tree_host()->source_frame_number() < 2) {
       layer_tree_host()->SetNeedsCommit();
     }
@@ skipping 620 matching lines @@
                                 layer_tree_host(),
                                 layer_settings());
 
     Layer* outer_scroll_layer =
         layer_tree_host()->outer_viewport_scroll_layer();
 
     Layer* root_scroll_layer =
         CreateScrollLayer(outer_scroll_layer, &root_scroll_layer_client_);
     CreateScrollLayer(outer_scroll_layer, &sibling_scroll_layer_client_);
     CreateScrollLayer(root_scroll_layer, &child_scroll_layer_client_);
+    fake_content_layer_client_.set_bounds(root_layer->bounds());
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
     LayerImpl* root = impl->OuterViewportScrollLayer();
     switch (impl->active_tree()->source_frame_number()) {
       case 0:
         root->child_at(0)->SetScrollDelta(gfx::Vector2dF(5, 5));
         root->child_at(0)->child_at(0)->SetScrollDelta(gfx::Vector2dF(5, 5));
@@ skipping 58 matching lines @@
   RunTest(true, false);
 }
 
 TEST_F(LayerTreeHostScrollTestLayerStructureChange, ScrollDestroyWholeTree) {
   scroll_destroy_whole_tree_ = true;
   RunTest(true, false);
 }
 
 }  // namespace
 }  // namespace cc