gfx: Make conversions from gfx::Point to PointF explicit.

cc/test/layer_tree_json_parser_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/test/layer_tree_json_parser.h"
 
 #include "cc/layers/layer.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
@@ skipping 60 matching lines @@
   LayerTreeImpl* tree = host_impl.active_tree();
 
   scoped_ptr<LayerImpl> root_impl(LayerImpl::Create(tree, 1));
   scoped_ptr<LayerImpl> parent(LayerImpl::Create(tree, 2));
   scoped_ptr<LayerImpl> child(LayerImpl::Create(tree, 3));
 
   root_impl->SetBounds(gfx::Size(100, 100));
   parent->SetBounds(gfx::Size(50, 50));
   child->SetBounds(gfx::Size(40, 40));
 
-  parent->SetPosition(gfx::Point(25, 25));
+  parent->SetPosition(gfx::PointF(25.f, 25.f));
 
   child->SetHaveWheelEventHandlers(true);
   child->SetHaveScrollEventHandlers(true);
 
   parent->AddChild(child.Pass());
   root_impl->AddChild(parent.Pass());
   tree->SetRootLayer(root_impl.Pass());
 
   std::string json = host_impl.LayerTreeAsJson();
   scoped_refptr<Layer> root = ParseTreeFromJson(json, NULL);
@@ skipping 23 matching lines @@
   root_impl->AddChild(touch_layer.Pass());
   tree->SetRootLayer(root_impl.Pass());
 
   std::string json = host_impl.LayerTreeAsJson();
   scoped_refptr<Layer> root = ParseTreeFromJson(json, NULL);
   ASSERT_TRUE(root.get());
   EXPECT_TRUE(LayerTreesMatch(host_impl.RootLayer(), root.get()));
 }
 
 }  // namespace cc