Add tinted static UI resource cache

chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc

Index: chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
diff --git a/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc b/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
index 913bd3142133268f799c7a968ed64f5722301c44..32c59fbda380eb2ffd8d8824807393652d659dd0 100644
--- a/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
+++ b/chrome/browser/android/compositor/scene_layer/tab_list_scene_layer.cc
@@ -40,6 +40,8 @@ void TabListSceneLayer::BeginBuildingFrame(JNIEnv* env,
   // matches PutTabLayer call order.
   for (auto tab : tab_map_)
     tab.second->layer()->RemoveFromParent();
+
+  used_tints_.clear();
 }
 
 void TabListSceneLayer::FinishBuildingFrame(JNIEnv* env,
@@ -53,6 +55,7 @@ void TabListSceneLayer::FinishBuildingFrame(JNIEnv* env,
       ++it;
   }
   visible_tabs_this_frame_.clear();
+  if (resource_manager_) resource_manager_->RemoveUnusedTints(used_tints_);

[aelias_OOO_until_Jul13, 2016/09/07 19:34:44]

Is there a scenario where "if (resource_manager_)" would do anything?  Can we
DCHECK instead?

[mdjones, 2016/09/08 16:34:44]

Done.

 }
 
 void TabListSceneLayer::UpdateLayer(
@@ -150,6 +153,11 @@ void TabListSceneLayer::PutTabLayer(
   own_tree_->AddChild(layer->layer());
   visible_tabs_this_frame_.insert(id);
 
+  // Add the tints for the border asset and close icon to the list that was
+  // used for this frame.
+  used_tints_.insert(toolbar_background_color);
+  used_tints_.insert(close_button_color);
+
   DCHECK(layer);
   if (layer) {
     layer->SetProperties(
@@ -162,8 +170,8 @@ void TabListSceneLayer::PutTabLayer(
         contour_alpha, shadow_alpha, close_alpha, border_scale, saturation,
         brightness, close_btn_width, static_to_view_blend, content_width,
         content_height, content_width, visible_content_height, show_toolbar,
-        default_theme_color, toolbar_background_color, close_button_color,
-        anonymize_toolbar, toolbar_textbox_resource_id,
+        default_theme_color, toolbar_background_color,
+        close_button_color, anonymize_toolbar, toolbar_textbox_resource_id,
         toolbar_textbox_background_color, toolbar_textbox_alpha, toolbar_alpha,
         toolbar_y_offset, side_border_scale, attach_content, inset_border);
   }