[cc] Enable specifying a overhang/gutter texture.

cc/trees/layer_tree_host.h

 // Copyright 2011 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 CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <list>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_events.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/input/input_handler.h"
 #include "cc/input/scrollbar.h"
 #include "cc/input/top_controls_state.h"
 #include "cc/layers/layer_lists.h"
 #include "cc/output/output_surface.h"
+#include "cc/resources/scoped_ui_resource.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "cc/resources/ui_resource_client.h"
 #include "cc/scheduler/rate_limiter.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "cc/trees/occlusion_tracker.h"
 #include "cc/trees/proxy.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/latency_info.h"
@@ skipping 180 matching lines @@
                                    float max_page_scale_factor);
   float page_scale_factor() const { return page_scale_factor_; }
 
   SkColor background_color() const { return background_color_; }
   void set_background_color(SkColor color) { background_color_ = color; }
 
   void set_has_transparent_background(bool transparent) {
     has_transparent_background_ = transparent;
   }
 
+  void SetOverhangBitmap(const SkBitmap& bitmap);
+
   PrioritizedResourceManager* contents_texture_manager() const {
     return contents_texture_manager_.get();
   }
 
   void SetVisible(bool visible);
   bool visible() const { return visible_; }
 
   void StartPageScaleAnimation(gfx::Vector2d target_offset,
                                bool use_anchor,
                                float scale,
@@ skipping 135 matching lines @@
 
   float page_scale_factor_;
   float min_page_scale_factor_;
   float max_page_scale_factor_;
   gfx::Transform impl_transform_;
   bool trigger_idle_updates_;
 
   SkColor background_color_;
   bool has_transparent_background_;
 
+  // If set, this texture is used to fill in the parts of the screen not
+  // covered by layers.
+  scoped_ptr<ScopedUIResource> overhang_ui_resource_;
+
   typedef ScopedPtrVector<PrioritizedResource> TextureList;
   size_t partial_texture_update_requests_;
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;
 
   struct PendingPageScaleAnimation {
     gfx::Vector2d target_offset;
     bool use_anchor;
     float scale;
     base::TimeDelta duration;
@@ skipping 19 matching lines @@
   };
   LCDTextMetrics lcd_text_metrics_;
   int tree_id_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_