gfx: Make conversions from Size to SizeF be explicit.

cc/trees/layer_tree_host_unittest_damage.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/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/time/time.h"
@@ skipping 340 matching lines @@
 
     scoped_refptr<Layer> scrollbar_layer = FakePaintedScrollbarLayer::Create(
         layer_settings(), false, true, content_layer->id());
     scrollbar_layer->SetPosition(gfx::Point(300, 300));
     scrollbar_layer->SetBounds(gfx::Size(10, 100));
     scrollbar_layer->ToScrollbarLayer()->SetClipLayer(scroll_clip_layer->id());
     scrollbar_layer->ToScrollbarLayer()->SetScrollLayer(content_layer->id());
     root_layer->AddChild(scrollbar_layer);
 
     gfx::RectF content_rect(content_layer->position(),
-                            content_layer->bounds());
+                            gfx::SizeF(content_layer->bounds()));
     gfx::RectF scrollbar_rect(scrollbar_layer->position(),
-                              scrollbar_layer->bounds());
+                              gfx::SizeF(scrollbar_layer->bounds()));
     EXPECT_FALSE(content_rect.Intersects(scrollbar_rect));
 
     LayerTreeHostDamageTest::SetupTree();
   }
 
  private:
   FakeContentLayerClient client_;
 };
 
 class LayerTreeHostDamageTestScrollbarDoesDamage
@@ skipping 155 matching lines @@
 
   void AfterTest() override { EXPECT_EQ(3, did_swaps_); }
 
   int did_swaps_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostDamageTestScrollbarCommitDoesNoDamage);
 
 }  // namespace
 }  // namespace cc