Fix snapshotting on linux by creating a separate automation path for

chrome/common/automation_messages_internal.h

 // Copyright (c) 2011 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.
 
 // Defines the IPC messages used by the automation interface.
 
 #include <string>
 #include <vector>
 
 #include "base/string16.h"
@@ skipping 1458 matching lines @@
 //   None expected
 IPC_MESSAGE_ROUTED1(AutomationMsg_MoveWindow,
                     gfx::Rect /* window position and dimentions */)
 
 // Is the browser in application mode?
 IPC_SYNC_MESSAGE_CONTROL1_2(AutomationMsg_IsBrowserInApplicationMode,
                             int /* browser_handle */,
                             bool /* is_application */,
                             bool /* success */)
 
+// Browser -> renderer messages.
+
+// Requests a snapshot.
+IPC_MESSAGE_ROUTED0(AutomationMsg_SnapshotEntirePage)
+
 // Renderer -> browser messages.
 
+// Sent as a response to |AutomationMsg_Snapshot|.
+IPC_MESSAGE_ROUTED3(AutomationMsg_SnapshotEntirePageACK,
+                    bool /* success */,
+                    std::vector<unsigned char> /* png bytes */,
+                    std::string /* error message */)
+
 // Sent when the renderer has scheduled a client redirect to occur.
 IPC_MESSAGE_ROUTED2(AutomationMsg_WillPerformClientRedirect,
                     int64 /* frame_id */,
                     double /* # of seconds till redirect will be performed */)
 
 // Sent when the renderer has completed or canceled a client redirect for a
 // particular frame. This message may be sent multiple times for the same
 // redirect.
 IPC_MESSAGE_ROUTED1(AutomationMsg_DidCompleteOrCancelClientRedirect,
                     int64 /* frame_id */)
 
 
 // YOUR NEW MESSAGE MIGHT NOT BELONG HERE.
 // This is the section for renderer -> browser automation messages. If it is
 // an automation <-> browser message, put it above this section.