Add Apps.AppListSearchResultDistanceFromOrigin UMA stat.

ui/app_list/views/search_result_page_view.cc

 // Copyright 2014 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 "ui/app_list/views/search_result_page_view.h"
 
 #include <algorithm>
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_switches.h"
@@ skipping 139 matching lines @@
   DCHECK(!result_container_views_.empty());
 
   if (switches::IsExperimentalAppListEnabled()) {
     // Sort the result container views by their score.
     std::sort(result_container_views_.begin(), result_container_views_.end(),
               [](const SearchResultContainerView* a,
                  const SearchResultContainerView* b) -> bool {
                 return a->container_score() > b->container_score();
               });
 
+    int result_y_index = 0;
     for (size_t i = 0; i < result_container_views_.size(); ++i) {
-      result_container_views_[i]->ClearSelectedIndex();
-      ReorderChildView(result_container_views_[i]->parent(), i);
+      SearchResultContainerView* view = result_container_views_[i];
+      view->ClearSelectedIndex();
+      ReorderChildView(view->parent(), i);
+
+      // Only notify containers that have finished updating.
+      if (view->UpdateScheduled())

[Matt Giuca, 2015/05/11 06:50:41]

Shouldn't you still take into account the GetYSize() of a container that has not
finished updating?

i.e.:

if (!view->UpdateScheduled())
  view->NotifyFirstResultYIndex(...);

result_y_index += view->GetYSize();  // (unconditionally)

[calamity, 2015/05/11 07:15:03]

Yeah.. I thought about this too. Ideally we'd clear all result containers at the
beginning of a search. I think there might other issues with that though..

I'll do this for now I guess. Practically, it doesn't actually come up because
both lists are updated basically simultaneously.

+        continue;
+
+      view->NotifyFirstResultYIndex(result_y_index);
+      result_y_index += view->GetYSize();
     }
   }
 
   Layout();
   SetSelectedIndex(0, false);
 }
 
 gfx::Rect SearchResultPageView::GetPageBoundsForState(
     AppListModel::State state) const {
   gfx::Rect onscreen_bounds = GetDefaultContentsBounds();
@@ skipping 18 matching lines @@
   set_clip_insets(bounds().InsetsFrom(onscreen_bounds));
 }
 
 int SearchResultPageView::GetSearchBoxZHeight() const {
   return switches::IsExperimentalAppListEnabled()
              ? kSearchResultZHeight
              : AppListPage::GetSearchBoxZHeight();
 }
 
 }  // namespace app_list