gfx: Make conversions from Size to SizeF be explicit.

ash/touch/touch_transformer_controller.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 "ash/touch/touch_transformer_controller.h"
 
 #include "ash/display/display_manager.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/host/ash_window_tree_host.h"
 #include "ash/root_window_controller.h"
@@ skipping 49 matching lines @@
           << ", Touchscreen size: " << touch_device.size.ToString()
           << ", Touch radius scale ratio: " << ratio;
   return ratio;
 }
 
 gfx::Transform TouchTransformerController::GetTouchTransform(
     const DisplayInfo& display,
     const DisplayInfo& touch_display,
     const ui::TouchscreenDevice& touchscreen,
     const gfx::Size& framebuffer_size) const {
-  gfx::SizeF current_size = display.bounds_in_native().size();
-  gfx::SizeF touch_native_size = touch_display.GetNativeModeSize();
+  auto current_size = gfx::SizeF(display.bounds_in_native().size());
+  auto touch_native_size = gfx::SizeF(touch_display.GetNativeModeSize());
 #if defined(USE_OZONE)
-  gfx::SizeF touch_area = touchscreen.size;
+  auto touch_area = gfx::SizeF(touchscreen.size);
 #elif defined(USE_X11)
   // On X11 touches are reported in the framebuffer coordinate space.
-  gfx::SizeF touch_area = framebuffer_size;
+  auto touch_area = gfx::SizeF(framebuffer_size);
 #endif
 
   gfx::Transform ctm;
 
   if (current_size.IsEmpty() || touch_native_size.IsEmpty() ||
       touch_area.IsEmpty() || touchscreen.id == ui::InputDevice::kInvalidId)
     return ctm;
 
 #if defined(USE_OZONE)
   // Translate the touch so that it falls within the display bounds.
@@ skipping 135 matching lines @@
 
 void TouchTransformerController::OnDisplaysInitialized() {
   UpdateTouchTransformer();
 }
 
 void TouchTransformerController::OnDisplayConfigurationChanged() {
   UpdateTouchTransformer();
 }
 
 }  // namespace ash