cros: Change padding of AppList item titles.

Change padding of title label in AppListItemView
from 0px to 8px to match specifications:

https://screenshot.googleplex.com/bmrE2eaixE0

Bug: 876503
Change-Id: Id12b3ddfe4bc95372d236b81468e25db5db576b5
Reviewed-on: https://chromium-review.googlesource.com/1186098Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Daniel Zhang <oxyflush@google.com>
Cr-Commit-Position: refs/heads/master@{#585570}

ash/app_list/views/app_list_item_view.cc

@@ -761,7 +761,9 @@ gfx::Rect AppListItemView::GetTitleBoundsForTargetViewBounds(
     const gfx::Rect& target_bounds,
     const gfx::Size& title_size) {
   gfx::Rect rect(target_bounds);
-  rect.Inset(0, AppListConfig::instance().grid_title_top_padding(), 0, 0);
+  rect.Inset(AppListConfig::instance().grid_title_horizontal_padding(),
+             AppListConfig::instance().grid_title_top_padding(),
+             AppListConfig::instance().grid_title_horizontal_padding(), 0);
   rect.ClampToCenteredSize(title_size);
   return rect;
 }

ash/public/cpp/app_list/app_list_config.cc

@@ -17,6 +17,7 @@ AppListConfig::AppListConfig()
       grid_icon_dimension_(48),
       grid_icon_bottom_padding_(3),
       grid_title_top_padding_(86),
+      grid_title_horizontal_padding_(8),
       grid_title_width_(80),
       grid_title_color_(SK_ColorWHITE),
       grid_focus_dimension_(64),

ash/public/cpp/app_list/app_list_config.h

@@ -31,6 +31,9 @@ class ASH_PUBLIC_EXPORT AppListConfig {
   int grid_icon_dimension() const { return grid_icon_dimension_; }
   int grid_icon_bottom_padding() const { return grid_icon_bottom_padding_; }
   int grid_title_top_padding() const { return grid_title_top_padding_; }
+  int grid_title_horizontal_padding() const {
+    return grid_title_horizontal_padding_;
+  }
   int grid_title_width() const { return grid_title_width_; }
   int grid_focus_dimension() const { return grid_focus_dimension_; }
   int grid_focus_corner_radius() const { return grid_focus_corner_radius_; }
@@ -147,8 +150,9 @@ class ASH_PUBLIC_EXPORT AppListConfig {
   // The icon bottom padding in tile views in apps grid view.
   int grid_icon_bottom_padding_;
 
-  // The title top padding in tile views in apps grid view.
+  // The title top and horizontal padding in tile views in apps grid view.
   int grid_title_top_padding_;
+  int grid_title_horizontal_padding_;
 
   // The title width and color of tile views in apps grid view.
   int grid_title_width_;