Improving the process model extension API

chrome/browser/task_manager/task_manager.cc

Index: chrome/browser/task_manager/task_manager.cc
diff --git a/chrome/browser/task_manager/task_manager.cc b/chrome/browser/task_manager/task_manager.cc
index 0457b63e780cdc2e2b85e85500100ab2f04b1068..d705421e18a498b8172d4d820288cb853f424e58 100644
--- a/chrome/browser/task_manager/task_manager.cc
+++ b/chrome/browser/task_manager/task_manager.cc
@@ -586,6 +586,15 @@ bool TaskManagerModel::GetV8Memory(int index, size_t* result) const {
   return true;
 }
 
+bool TaskManagerModel::GetV8MemoryUsed(int index, size_t* result) const {
+  *result = 0;
+  if (!resources_[index]->ReportsV8MemoryStats())
+    return false;
+
+  *result = resources_[index]->GetV8MemoryUsed();
+  return true;
+}
+
 bool TaskManagerModel::CanActivate(int index) const {
   CHECK_LT(index, ResourceCount());
   return GetResourceTabContents(index) != NULL;
@@ -758,10 +767,16 @@ void TaskManagerModel::RemoveResource(TaskManager::Resource* resource) {
       cpu_usage_map_.erase(cpu_iter);
   }
 
-  // Remove the entry from the model list.
+  // Prepare to remove the entry from the model list.
   iter = std::find(resources_.begin(), resources_.end(), resource);
   DCHECK(iter != resources_.end());
   int index = static_cast<int>(iter - resources_.begin());
+
+  // Notify the observers that the contents will change.
+  FOR_EACH_OBSERVER(TaskManagerModelObserver, observer_list_,
+                    OnItemsToBeRemoved(index, 1));
+
+  // Now actually remove the entry from the model list.
   resources_.erase(iter);
 
   // Remove the entry from the network maps.