gfx: Make conversions from Size to SizeF be explicit.

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 <limits>
 #include <map>
 #include <set>
@@ skipping 434 matching lines @@
     const gfx::Vector2d& target_offset,
     bool anchor_point,
     float page_scale,
     base::TimeDelta duration) {
   if (!InnerViewportScrollLayer())
     return;
 
   gfx::ScrollOffset scroll_total = active_tree_->TotalScrollOffset();
   gfx::SizeF scaled_scrollable_size = active_tree_->ScrollableSize();
   gfx::SizeF viewport_size =
-      active_tree_->InnerViewportContainerLayer()->bounds();
+      gfx::SizeF(active_tree_->InnerViewportContainerLayer()->bounds());
 
   // Easing constants experimentally determined.
   scoped_ptr<TimingFunction> timing_function =
       CubicBezierTimingFunction::Create(.8, 0, .3, .9);
 
   // TODO(miletus) : Pass in ScrollOffset.
   page_scale_animation_ = PageScaleAnimation::Create(
       ScrollOffsetToVector2dF(scroll_total),
       active_tree_->current_page_scale_factor(), viewport_size,
       scaled_scrollable_size, timing_function.Pass());
@@ skipping 1774 matching lines @@
   if (pending_tree_)
     active_tree_->SetViewportSizeInvalid();
 
   device_viewport_size_ = device_viewport_size;
 
   UpdateViewportContainerSizes();
   client_->OnCanDrawStateChanged(CanDraw());
   SetFullRootLayerDamage();
   active_tree_->set_needs_update_draw_properties();
   active_tree_->property_trees()->clip_tree.SetViewportClip(
-      gfx::RectF(device_viewport_size));
+      gfx::RectF(gfx::SizeF(device_viewport_size)));
 }
 
 void LayerTreeHostImpl::SetDeviceScaleFactor(float device_scale_factor) {
   if (device_scale_factor == device_scale_factor_)
     return;
   device_scale_factor_ = device_scale_factor;
 
   SetFullRootLayerDamage();
 }
 
@@ skipping 1339 matching lines @@
   if (active_tree()) {
     LayerAnimationValueProvider* layer = active_tree()->LayerById(layer_id);
     if (layer)
       return layer->ScrollOffsetForAnimation();
   }
 
   return gfx::ScrollOffset();
 }
 
 }  // namespace cc