cc: Allow pepper to avoid DCHECK but reuse gpu::Mailbox.

cc/layers/texture_layer.h

 // Copyright 2010 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_LAYERS_TEXTURE_LAYER_H_
 #define CC_LAYERS_TEXTURE_LAYER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 113 matching lines @@
 
   // Code path for plugins which supply their own texture ID.
   // DEPRECATED. DO NOT USE.
   void SetTextureId(unsigned texture_id);
 
   // Code path for plugins which supply their own mailbox.
   bool uses_mailbox() const { return uses_mailbox_; }
   void SetTextureMailbox(const TextureMailbox& mailbox,
                          scoped_ptr<SingleReleaseCallback> release_callback);
 
+  // Use this for special cases where the same texture is used to back the
+  // TextureLayer across all frames.
+  // WARNING: DON'T ACTUALLY USE THIS WHAT YOU ARE DOING IS WRONG.
+  // TODO(danakj): Remove this when pepper doesn't need it. crbug.com/350204
+  void SetTextureMailboxWithoutReleaseCallback(const TextureMailbox& mailbox);
+
   void WillModifyTexture();
 
   virtual void SetNeedsDisplayRect(const gfx::RectF& dirty_rect) OVERRIDE;
 
   virtual void SetLayerTreeHost(LayerTreeHost* layer_tree_host) OVERRIDE;
   virtual bool DrawsContent() const OVERRIDE;
   virtual bool Update(ResourceUpdateQueue* queue,
                       const OcclusionTracker<Layer>* occlusion) OVERRIDE;
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
   virtual Region VisibleContentOpaqueRegion() const OVERRIDE;
 
  protected:
   TextureLayer(TextureLayerClient* client, bool uses_mailbox);
   virtual ~TextureLayer();
 
  private:
   void SetTextureMailboxInternal(
       const TextureMailbox& mailbox,
       scoped_ptr<SingleReleaseCallback> release_callback,
-      bool requires_commit);
+      bool requires_commit,
+      bool allow_mailbox_reuse);
 
   TextureLayerClient* client_;
   bool uses_mailbox_;
 
   bool flipped_;
   gfx::PointF uv_top_left_;
   gfx::PointF uv_bottom_right_;
   // [bottom left, top left, top right, bottom right]
   float vertex_opacity_[4];
   bool premultiplied_alpha_;
   bool blend_background_color_;
   bool rate_limit_context_;
   bool content_committed_;
 
   unsigned texture_id_;
   scoped_ptr<TextureMailboxHolder::MainThreadReference> holder_ref_;
   bool needs_set_mailbox_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureLayer);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_TEXTURE_LAYER_H_