Implement Atk Component interface 'grab_focus' for Chrome UI

ui/accessibility/platform/ax_platform_node_auralinux.cc

Index: ui/accessibility/platform/ax_platform_node_auralinux.cc
diff --git a/ui/accessibility/platform/ax_platform_node_auralinux.cc b/ui/accessibility/platform/ax_platform_node_auralinux.cc
index 722280a97784ca0da65ad42f4fa3ca48db91269c..320d0d0709d87f64c5d63552c82753f9c862394f 100644
--- a/ui/accessibility/platform/ax_platform_node_auralinux.cc
+++ b/ui/accessibility/platform/ax_platform_node_auralinux.cc
@@ -264,10 +264,18 @@ static void ax_platform_node_auralinux_get_size(AtkComponent* atk_component,
   obj->GetSize(width, height);
 }
 
+static gboolean ax_platform_node_auralinux_grab_focus(
+    AtkComponent* atk_component) {
+  g_return_val_if_fail(ATK_IS_COMPONENT(atk_component), FALSE);
+
+  return atk_component_grab_focus(atk_component);

[dmazzoni, 2015/07/21 15:49:01]

You're implementing atk_component_grab_focus for our component, by calling
atk_component_grab_focus, I think this will just result in an endless loop.

You need to add a new API to AXPlatformNodeDelegate to set focus.

+}
+
 void ax_component_interface_base_init(AtkComponentIface* iface) {
   iface->get_extents = ax_platform_node_auralinux_get_extents;
   iface->get_position = ax_platform_node_auralinux_get_position;
   iface->get_size = ax_platform_node_auralinux_get_size;
+  iface->grab_focus = ax_platform_node_auralinux_grab_focus;
 }
 
 static const GInterfaceInfo ComponentInfo = {