aura: Make aura::TooltipClient completely static?

ui/aura_shell/shell_tooltip_manager.cc

Index: ui/aura_shell/shell_tooltip_manager.cc
diff --git a/ui/aura_shell/shell_tooltip_manager.cc b/ui/aura_shell/shell_tooltip_manager.cc
index 0544ca8c4f65105b5aa8ddc915129ccb005170f7..a8d6cf920fc7d3a68f3ef6b8e87893e46f2c9fcc 100644
--- a/ui/aura_shell/shell_tooltip_manager.cc
+++ b/ui/aura_shell/shell_tooltip_manager.cc
@@ -29,6 +29,8 @@ namespace {
 SkColor kTooltipBackground = 0xFFFFFFCC;
 SkColor kTooltipBorder = 0xFF000000;
 int kTooltipBorderWidth = 1;
+int kTooltipHorizontalPadding = 3;
+int kTooltipVerticalPadding = 1;
 int kTooltipTimeoutMs = 500;
 
 // FIXME: get cursor offset from actual cursor size.
@@ -126,8 +128,9 @@ class ShellTooltipManager::Tooltip {
                      location.x(), location.y());
     label_.SetText(tooltip_text);
 
-    SetTooltipBounds(location, max_width + 2 * kTooltipBorderWidth,
-                     label_.GetPreferredSize().height());
+    SetTooltipBounds(location,
+        max_width + 2 * kTooltipBorderWidth + 2 * kTooltipHorizontalPadding,
+        label_.GetPreferredSize().height() + 2 * kTooltipVerticalPadding);
   }
 
   // Shows the tooltip.
@@ -278,4 +281,10 @@ int TooltipClient::GetMaxWidth(int x, int y) {
   return (monitor_bounds.width() + 1) / 2;
 }
 
+// static
+void TooltipClient::UpdateTooltip(Window* target) {
+  if (aura_shell::Shell::GetInstance()->tooltip_manager())
+    aura_shell::Shell::GetInstance()->tooltip_manager()->UpdateTooltip(target);
+}
+
 }  // namespace aura