Make PageScaleFactor work for oopif subframes.

cc/input/browser_controls_offset_manager_unittest.cc

 // 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.
 
 #include "cc/input/browser_controls_offset_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 21 matching lines @@
       : host_impl_(&task_runner_provider_,
                    &task_graph_runner_),
         redraw_needed_(false),
         update_draw_properties_needed_(false),
         bottom_controls_height_(0.f),
         top_controls_shown_ratio_(1.f),
         top_controls_height_(top_controls_height),
         browser_controls_show_threshold_(browser_controls_show_threshold),
         browser_controls_hide_threshold_(browser_controls_hide_threshold) {
     active_tree_ = base::MakeUnique<LayerTreeImpl>(
-        &host_impl_, new SyncedProperty<ScaleGroup>, new SyncedBrowserControls,
+        &host_impl_, new SyncedProperty<ScaleGroup>,
+        new SyncedProperty<ScaleGroup>, new SyncedBrowserControls,
         new SyncedElasticOverscroll);
     root_scroll_layer_ = LayerImpl::Create(active_tree_.get(), 1);
   }
 
   ~MockBrowserControlsOffsetManagerClient() override {}
 
   void DidChangeBrowserControlsPosition() override {
     redraw_needed_ = true;
     update_draw_properties_needed_ = true;
   }
@@ skipping 492 matching lines @@
   EXPECT_TRUE(manager->has_animation());
   EXPECT_FLOAT_EQ(1.f, client.CurrentBrowserControlsShownRatio());
 
   manager->UpdateBrowserControlsState(BOTH, SHOWN, true);
   EXPECT_FALSE(manager->has_animation());
   EXPECT_FLOAT_EQ(1.f, client.CurrentBrowserControlsShownRatio());
 }
 
 }  // namespace
 }  // namespace cc