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

cc/layers/viewport.cc

 // Copyright 2015 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/layers/viewport.h"
 
 #include "base/logging.h"
 #include "cc/input/top_controls_manager.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/layer_tree_impl.h"
@@ skipping 81 matching lines @@
     pinch_zoom_active_ = true;
   }
 
   LayerTreeImpl* active_tree = host_impl_->active_tree();
 
   // Keep the center-of-pinch anchor specified by (x, y) in a stable
   // position over the course of the magnify.
   gfx::Point adjusted_anchor = anchor + pinch_anchor_adjustment_;
   float page_scale = active_tree->current_page_scale_factor();
   gfx::PointF previous_scale_anchor =
-      gfx::ScalePoint(adjusted_anchor, 1.f / page_scale);
+      gfx::ScalePoint(gfx::PointF(adjusted_anchor), 1.f / page_scale);
   active_tree->SetPageScaleOnActiveTree(page_scale * magnify_delta);
   page_scale = active_tree->current_page_scale_factor();
   gfx::PointF new_scale_anchor =
-      gfx::ScalePoint(adjusted_anchor, 1.f / page_scale);
+      gfx::ScalePoint(gfx::PointF(adjusted_anchor), 1.f / page_scale);
   gfx::Vector2dF move = previous_scale_anchor - new_scale_anchor;
 
   // Scale back to viewport space since that's the coordinate space ScrollBy
   // uses.
   move.Scale(page_scale);
 
   // If clamping the inner viewport scroll offset causes a change, it should
   // be accounted for from the intended move.
   move -= InnerScrollLayer()->ClampScrollToMaxScrollOffset();
 
@@ skipping 62 matching lines @@
 
 LayerImpl* Viewport::InnerScrollLayer() const {
   return host_impl_->InnerViewportScrollLayer();
 }
 
 LayerImpl* Viewport::OuterScrollLayer() const {
   return host_impl_->OuterViewportScrollLayer();
 }
 
 }  // namespace cc