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

cc/trees/occlusion_tracker_perftest.cc

 // Copyright 2014 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/occlusion_tracker.h"
 
 #include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "cc/debug/lap_timer.h"
 #include "cc/layers/layer_iterator.h"
@@ skipping 141 matching lines @@
   host_impl_->SetViewportSize(viewport_rect.size());
 
   for (int i = 0; i < kNumOpaqueLayers; ++i) {
     scoped_ptr<SolidColorLayerImpl> opaque_layer =
         SolidColorLayerImpl::Create(active_tree(), 2 + i);
     opaque_layer->SetBackgroundColor(SK_ColorRED);
     opaque_layer->SetContentsOpaque(true);
     opaque_layer->SetDrawsContent(true);
     opaque_layer->SetBounds(
         gfx::Size(viewport_rect.width() / 2, viewport_rect.height() / 2));
-    opaque_layer->SetPosition(gfx::Point(i, i));
+    opaque_layer->SetPosition(gfx::PointF(i, i));
     active_tree()->root_layer()->AddChild(opaque_layer.Pass());
   }
 
   bool update_lcd_text = false;
   active_tree()->UpdateDrawProperties(update_lcd_text);
   const LayerImplList& rsll = active_tree()->RenderSurfaceLayerList();
   ASSERT_EQ(1u, rsll.size());
   EXPECT_EQ(static_cast<size_t>(kNumOpaqueLayers),
             rsll[0]->render_surface()->layer_list().size());
 
@@ skipping 33 matching lines @@
   EXPECT_EQ(active_tree()->root_layer(), next.current_layer);
 
   ++begin;
   EXPECT_EQ(end, begin);
 
   PrintResults();
 }
 
 }  // namespace
 }  // namespace cc