exo: Select cursor capture scale at run time

components/exo/pointer.h

 // 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.
 
 #ifndef COMPONENTS_EXO_POINTER_H_
 #define COMPONENTS_EXO_POINTER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 93 matching lines @@
 
   // The position of the pointer surface relative to the pointer location.
   gfx::Point hotspot_;
 
   // Latest cursor snapshot.
   SkBitmap cursor_bitmap_;
 
   // The current cursor.
   ui::Cursor cursor_;
 
+  // Scale at which cursor snapshot is captured. The resulting bitmap is scaled
+  // on displays whose DSF does not match this scale.
+  float capture_scale_;
+
   // Source used for cursor capture copy output requests.
   const base::UnguessableToken cursor_capture_source_id_;
 
   // Last received event type.
   ui::EventType last_event_type_ = ui::ET_UNKNOWN;
 
   // Weak pointer factory used for cursor capture callbacks.
   base::WeakPtrFactory<Pointer> cursor_capture_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Pointer);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_POINTER_H_