cc: Make tiling interest rect calc based on viewport.

cc/test/impl_side_painting_settings.h

 // Copyright 2013 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.
 
 #ifndef CC_TEST_IMPL_SIDE_PAINTING_SETTINGS_H_
 #define CC_TEST_IMPL_SIDE_PAINTING_SETTINGS_H_
 
 #include "cc/trees/layer_tree_settings.h"
 
 namespace cc {
 
 class ImplSidePaintingSettings : public LayerTreeSettings {
  public:
   ImplSidePaintingSettings() {
     impl_side_painting = true;
   }
 
-  explicit ImplSidePaintingSettings(int interest_rect_tiles) {
+  explicit ImplSidePaintingSettings(float viewport_multiplier) {
     impl_side_painting = true;
-    max_tiles_for_interest_area = interest_rect_tiles;
+    tiling_interest_area_viewport_multiplier = viewport_multiplier;
   }
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_IMPL_SIDE_PAINTING_SETTINGS_H_