Add Android AX functions to set the value and selection of a text field.

content/common/accessibility_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for accessibility.
 // Multiply-included message file, hence no include guard.
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 #include "content/common/view_message_enums.h"
@@ skipping 104 matching lines @@
                     int /* object id */,
                     gfx::Point /* new location */)
 
 // Relay a request from assistive technology to set the cursor or
 // selection within an editable text element.
 IPC_MESSAGE_ROUTED3(AccessibilityMsg_SetTextSelection,
                     int /* object id */,
                     int /* New start offset */,
                     int /* New end offset */)
 
+// Relay a request from assistive technology to set the value of an
+// editable text element.
+IPC_MESSAGE_ROUTED2(AccessibilityMsg_SetValue,
+                    int /* object id */,
+                    base::string16 /* Value */)
+
 // Determine the accessibility object under a given point and reply with
 // a AccessibilityHostMsg_HitTestResult with the same id.
 IPC_MESSAGE_ROUTED1(AccessibilityMsg_HitTest,
                     gfx::Point /* location to test */)
 
 // Tells the render view that a AccessibilityHostMsg_Events
 // message was processed and it can send addition events.
 IPC_MESSAGE_ROUTED0(AccessibilityMsg_Events_ACK)
 
 // Tell the renderer to reset and send a new accessibility tree from
@@ skipping 20 matching lines @@
 // Any other time, it ignores IPCs with a reset token.
 IPC_MESSAGE_ROUTED2(
     AccessibilityHostMsg_Events,
     std::vector<AccessibilityHostMsg_EventParams> /* events */,
     int /* reset_token */)
 
 // Sent to update the browser of the location of accessibility objects.
 IPC_MESSAGE_ROUTED1(
     AccessibilityHostMsg_LocationChanges,
     std::vector<AccessibilityHostMsg_LocationChangeParams>)