Blink handle selection handle visibility

cc/trees/layer_tree_host_impl.cc

 // 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.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 757 matching lines @@
   RenderSurfaceImpl* root_surface = active_tree_->RootRenderSurface();
   bool root_surface_has_no_visible_damage =
       !root_surface->damage_tracker()->current_damage_rect().Intersects(
           root_surface->content_rect());
   bool root_surface_has_contributing_layers =
       !root_surface->layer_list().empty();
   bool hud_wants_to_draw_ = active_tree_->hud_layer() &&
                             active_tree_->hud_layer()->IsAnimatingHUDContents();
   bool must_always_swap =
       compositor_frame_sink_->capabilities().must_always_swap;
+  // When touch handle visibility changes there is no visible damage
+  // because touch handles are composited in the browser. However we
+  // still want the browser to be notified that the handles changed
+  // through the |ViewHostMsg_SwapCompositorFrame| IPC so we keep
+  // track of handle visibility changes through |handle_visibility_changed|.
+  bool handle_visibility_changed =
+      active_tree_->GetAndResetHandleVisibilityChanged();
   if (root_surface_has_contributing_layers &&
       root_surface_has_no_visible_damage &&
       !active_tree_->property_trees()->effect_tree.HasCopyRequests() &&
-      !must_always_swap && !hud_wants_to_draw_) {
+      !must_always_swap && !hud_wants_to_draw_ && !handle_visibility_changed) {
     TRACE_EVENT0("cc",
                  "LayerTreeHostImpl::CalculateRenderPasses::EmptyDamageRect");
     frame->has_no_damage = true;
     DCHECK(!resourceless_software_draw_);
     return DRAW_SUCCESS;
   }
 
   TRACE_EVENT_BEGIN2(
       "cc", "LayerTreeHostImpl::CalculateRenderPasses",
       "render_surface_layer_list.size()",
@@ skipping 3288 matching lines @@
       worker_context_visibility_ =
           worker_context->CacheController()->ClientBecameVisible();
     } else {
       worker_context->CacheController()->ClientBecameNotVisible(
           std::move(worker_context_visibility_));
     }
   }
 }
 
 }  // namespace cc