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

cc/layers/texture_layer.h

Index: cc/layers/texture_layer.h
diff --git a/cc/layers/texture_layer.h b/cc/layers/texture_layer.h
index 6ef413cffeda3c11711bc50ded8b13ec5a1360de..009a217ae6a97cf6818d92912c8a498d9917ccbf 100644
--- a/cc/layers/texture_layer.h
+++ b/cc/layers/texture_layer.h
@@ -131,6 +131,12 @@ class CC_EXPORT TextureLayer : public Layer {
   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;
@@ -150,7 +156,8 @@ class CC_EXPORT TextureLayer : public Layer {
   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_;