cc: HUD handle context lost in Gpu raster.

cc/layers/heads_up_display_layer_impl.h

Index: cc/layers/heads_up_display_layer_impl.h
diff --git a/cc/layers/heads_up_display_layer_impl.h b/cc/layers/heads_up_display_layer_impl.h
index b9f6afcdaa8a6aeacfca6c9e0ea68fbc1e25d868..42c676dbeda80be149f5466286f34e5f07aa5e18 100644
--- a/cc/layers/heads_up_display_layer_impl.h
+++ b/cc/layers/heads_up_display_layer_impl.h
@@ -43,9 +43,12 @@ class CC_EXPORT HeadsUpDisplayLayerImpl : public LayerImpl {
                 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);
+
+  // This returns the quad ResourceID to evict in case it fails to update
+  // Hud contents. Otherwise returns 0.
+  ResourceId UpdateHudTexture(DrawMode draw_mode,
+                              ResourceProvider* resource_provider,
+                              ContextProvider* context_provider);
 
   void ReleaseResources() override;
 
@@ -55,6 +58,9 @@ class CC_EXPORT HeadsUpDisplayLayerImpl : public LayerImpl {
 
   void SetHUDTypeface(sk_sp<SkTypeface> typeface);
 
+  // This evicts hud quad appended during render pass preparation.
+  void EvictHudQuad(const RenderPassList& list);
+
   // LayerImpl overrides.
   void PushPropertiesTo(LayerImpl* layer) override;