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

cc/trees/layer_tree_host_common_perftest.cc

Index: cc/trees/layer_tree_host_common_perftest.cc
diff --git a/cc/trees/layer_tree_host_common_perftest.cc b/cc/trees/layer_tree_host_common_perftest.cc
index 1373af855fc74026942d3a2b83dc28c685270716..df1a3a2a2987ec9d092061dd4e27f54da0e4478b 100644
--- a/cc/trees/layer_tree_host_common_perftest.cc
+++ b/cc/trees/layer_tree_host_common_perftest.cc
@@ -55,6 +55,7 @@ class LayerTreeHostCommonPerfTest : public LayerTreeTest {
         ParseTreeFromJson(json_, &content_layer_client_);
     ASSERT_TRUE(root.get());
     layer_tree_host()->SetRootLayer(root);
+    content_layer_client_.set_bounds(viewport);
   }
 
   void SetTestName(const std::string& name) { test_name_ = name; }