Implement Atk Component interface 'grab_focus' for Chrome UI

ui/accessibility/platform/ax_platform_node_auralinux.cc

 // Copyright 2015 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/accessibility/platform/ax_platform_node_auralinux.h"
 
 #include "base/command_line.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/task_runner.h"
 #include "ui/accessibility/ax_node_data.h"
@@ skipping 246 matching lines @@
 
   AtkObject* atk_object = ATK_OBJECT(atk_component);
   ui::AXPlatformNodeAuraLinux* obj =
       AtkObjectToAXPlatformNodeAuraLinux(atk_object);
   if (!obj)
     return;
 
   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 = {
   reinterpret_cast<GInterfaceInitFunc>(ax_component_interface_base_init), 0, 0
 };
 
 //
 // The rest of the AXPlatformNodeAuraLinux code, not specific to one
 // of the Atk* interfaces.
 //
@@ skipping 250 matching lines @@
 
 void AXPlatformNodeAuraLinux::GetSize(gint* width, gint* height) {
   gfx::Rect rect_size = GetData().location;
   if (width)
     *width = rect_size.width();
   if (height)
     *height = rect_size.height();
 }
 
 }  // namespace ui