[Android] Allow custom ActionMode creation via ContentViewClient

ui/base/touch/selection_bound.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 <algorithm>
 
 #include "base/macros.h"
 #include "ui/base/touch/selection_bound.h"
 #include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 47 matching lines @@
 
   gfx::Point bottom_right(b1.edge_top_rounded());
   bottom_right.SetToMax(b1.edge_bottom_rounded());
   bottom_right.SetToMax(b2.edge_top_rounded());
   bottom_right.SetToMax(b2.edge_bottom_rounded());
 
   gfx::Vector2d diff = bottom_right - top_left;
   return gfx::Rect(top_left, gfx::Size(diff.x(), diff.y()));
 }
 
+gfx::RectF RectFBetweenSelectionBounds(const SelectionBound& b1,
+                                       const SelectionBound& b2) {
+  gfx::PointF top_left(b1.edge_top());
+  top_left.SetToMin(b1.edge_bottom());
+  top_left.SetToMin(b2.edge_top());
+  top_left.SetToMin(b2.edge_bottom());
+
+  gfx::PointF bottom_right(b1.edge_top());
+  bottom_right.SetToMax(b1.edge_bottom());
+  bottom_right.SetToMax(b2.edge_top());
+  bottom_right.SetToMax(b2.edge_bottom());
+
+  gfx::Vector2dF diff = bottom_right - top_left;
+  return gfx::RectF(top_left, gfx::SizeF(diff.x(), diff.y()));
+}
+
 }  // namespace ui