[WebView] Fix issue with transparent background.

android_webview/browser/browser_view_renderer.h

 // Copyright (c) 2013 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 ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 
 #include "android_webview/browser/global_tile_manager.h"
 #include "android_webview/browser/global_tile_manager_client.h"
 #include "android_webview/browser/shared_renderer_state.h"
@@ skipping 81 matching lines @@
   void SetIsPaused(bool paused);
   void SetViewVisibility(bool visible);
   void SetWindowVisibility(bool visible);
   void OnSizeChanged(int width, int height);
   void OnAttachedToWindow(int width, int height);
   void OnDetachedFromWindow();
 
   // Sets the scale for logical<->physical pixel conversions.
   void SetDipScale(float dip_scale);
 
-  // Sets the background of the layer tree to transparent.
-  void SetHasTransparentBackground(bool transparent);
-
   // Set the root layer scroll offset to |new_value|.
   void ScrollTo(gfx::Vector2d new_value);
 
   // Android views hierarchy gluing.
   bool IsVisible() const;
   gfx::Rect GetScreenRect() const;
   bool attached_to_window() const { return attached_to_window_; }
   bool hardware_enabled() const { return hardware_enabled_; }
 
   // Set the memory policy in shared renderer state and request the tiles from
@@ skipping 73 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 
   content::SynchronousCompositor* compositor_;
 
   bool is_paused_;
   bool view_visible_;
   bool window_visible_;  // Only applicable if |attached_to_window_| is true.
   bool attached_to_window_;
   bool hardware_enabled_;
   float dip_scale_;
-  bool has_transparent_background_;
   float page_scale_factor_;
   bool on_new_picture_enable_;
   bool clear_view_;
 
   gfx::Vector2d last_on_draw_scroll_offset_;
   gfx::Rect last_on_draw_global_visible_rect_;
 
   // When true, we should continuously invalidate and keep drawing, for example
   // to drive animation. This value is set by the compositor and should always
   // reflect the expectation of the compositor and not be reused for other
@@ skipping 27 matching lines @@
   // policy on the shared_renderer_state_ atomically.
   size_t num_tiles_;
   size_t num_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_