Converts Widget::SetOpacity from char to float

ui/views/widget/native_widget_private.h

 // Copyright (c) 2012 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 UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 182 matching lines @@
   virtual void SetAlwaysOnTop(bool always_on_top) = 0;
   virtual bool IsAlwaysOnTop() const = 0;
   virtual void SetVisibleOnAllWorkspaces(bool always_visible) = 0;
   virtual void Maximize() = 0;
   virtual void Minimize() = 0;
   virtual bool IsMaximized() const = 0;
   virtual bool IsMinimized() const = 0;
   virtual void Restore() = 0;
   virtual void SetFullscreen(bool fullscreen) = 0;
   virtual bool IsFullscreen() const = 0;
-  virtual void SetOpacity(unsigned char opacity) = 0;
+  virtual void SetOpacity(float opacity) = 0;
   virtual void FlashFrame(bool flash) = 0;
   virtual void RunShellDrag(View* view,
                             const ui::OSExchangeData& data,
                             const gfx::Point& location,
                             int operation,
                             ui::DragDropTypes::DragEventSource source) = 0;
   virtual void SchedulePaintInRect(const gfx::Rect& rect) = 0;
   virtual void SetCursor(gfx::NativeCursor cursor) = 0;
   virtual bool IsMouseEventsEnabled() const = 0;
   virtual void ClearNativeFocus() = 0;
@@ skipping 20 matching lines @@
   virtual std::string GetName() const = 0;
 
   // Overridden from NativeWidget:
   internal::NativeWidgetPrivate* AsNativeWidgetPrivate() override;
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_PRIVATE_H_