Pass accessible location change messages to the automation API.

chrome/common/extensions/chrome_extension_messages.h

Index: chrome/common/extensions/chrome_extension_messages.h
diff --git a/chrome/common/extensions/chrome_extension_messages.h b/chrome/common/extensions/chrome_extension_messages.h
index a5236b3c38c4711c41b3efcef1723d3352783bdc..a15e1e986ce8cb4b72abf887ac8d52b7cb027ddf 100644
--- a/chrome/common/extensions/chrome_extension_messages.h
+++ b/chrome/common/extensions/chrome_extension_messages.h
@@ -21,6 +21,7 @@
 #include "ipc/ipc_message_macros.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_node_data.h"
+#include "ui/accessibility/ax_relative_bounds.h"
 #include "ui/accessibility/ax_tree_data.h"
 #include "ui/accessibility/ax_tree_update.h"
 #include "ui/gfx/transform.h"
@@ -118,12 +119,29 @@ IPC_STRUCT_BEGIN(ExtensionMsg_AccessibilityEventParams)
   IPC_STRUCT_MEMBER(int, id)
 IPC_STRUCT_END()
 
+IPC_STRUCT_BEGIN(ExtensionMsg_AccessibilityLocationChangeParams)
+  // ID of the accessibility tree that this event applies to.
+  IPC_STRUCT_MEMBER(int, tree_id)
+
+  // ID of the object whose location is changing.
+  IPC_STRUCT_MEMBER(int, id)
+
+  // The object's new location info.
+  IPC_STRUCT_MEMBER(ui::AXRelativeBounds, new_location)
+IPC_STRUCT_END()
+
 // Forward an accessibility message to an extension process where an
 // extension is using the automation API to listen for accessibility events.
 IPC_MESSAGE_ROUTED2(ExtensionMsg_AccessibilityEvent,
                     ExtensionMsg_AccessibilityEventParams,
                     bool /* is_active_profile */)
 
+// Forward an accessibility location change message to an extension process
+// where an extension is using the automation API to listen for
+// accessibility events.
+IPC_MESSAGE_ROUTED1(ExtensionMsg_AccessibilityLocationChange,
+                    ExtensionMsg_AccessibilityLocationChangeParams)
+
 // Messages sent from the renderer to the browser.