cc: HUD handle context lost in Gpu raster.

cc/layers/heads_up_display_layer_impl.h

 // Copyright 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 CC_LAYERS_HEADS_UP_DISPLAY_LAYER_IMPL_H_
 #define CC_LAYERS_HEADS_UP_DISPLAY_LAYER_IMPL_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 25 matching lines @@
     return base::WrapUnique(new HeadsUpDisplayLayerImpl(tree_impl, id));
   }
   ~HeadsUpDisplayLayerImpl() override;
 
   std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
 
   bool WillDraw(DrawMode draw_mode,
                 ResourceProvider* resource_provider) override;
   void AppendQuads(RenderPass* render_pass,
                    AppendQuadsData* append_quads_data) override;
-  void UpdateHudTexture(DrawMode draw_mode,
-                        ResourceProvider* resource_provider,
-                        ContextProvider* context_provider);
+  uint32_t UpdateHudTexture(DrawMode draw_mode,

[vmpstr, 2017/06/30 23:16:51]

Can you leave a comment on what this returns. 

+                            ResourceProvider* resource_provider,
+                            ContextProvider* context_provider);
 
   void ReleaseResources() override;
 
   gfx::Rect GetEnclosingRectInTargetSpace() const override;
 
   bool IsAnimatingHUDContents() const { return fade_step_ > 0; }
 
   void SetHUDTypeface(sk_sp<SkTypeface> typeface);
 
   // LayerImpl overrides.
@@ skipping 88 matching lines @@
   std::vector<DebugRect> paint_rects_;
 
   base::TimeTicks time_of_last_graph_update_;
 
   DISALLOW_COPY_AND_ASSIGN(HeadsUpDisplayLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_HEADS_UP_DISPLAY_LAYER_IMPL_H_