Add basic support to dump pixel results

content/shell/shell_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.
 
 // Multiply-included file, no traditional include guard.
 #include <string>
 
+#include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_message_macros.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 
 #define IPC_MESSAGE_START ShellMsgStart
 
 // Tells the render view to capture a text dump of the page. The render view
 // responds with a ShellViewHostMsg_TextDump.
 IPC_MESSAGE_ROUTED3(ShellViewMsg_CaptureTextDump,
                     bool /* as_text */,
                     bool /* printing */,
                     bool /* recursive */)
 
+// Tells the render view to capture an image of the page. The render view
+// responds with a ShelLViewHostMsg_ImageDump.
+IPC_MESSAGE_ROUTED0(ShellViewMsg_CaptureImageDump)
+
 // Send a text dump of the WebContents to the render host.
 IPC_MESSAGE_ROUTED1(ShellViewHostMsg_TextDump,
                     std::string /* dump */)
 
+// Send an image dump of the WebContents to the render host.
+IPC_MESSAGE_ROUTED1(ShellViewHostMsg_ImageDump,
+                    SkBitmap /* image */)
+
 // The main frame of the render view finished loading.
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_DidFinishLoad)
 
 // The following messages correspond to methods of the layoutTestController.
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_NotifyDone)
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_DumpAsText)
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_DumpChildFramesAsText)
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_SetPrinting)
 IPC_MESSAGE_ROUTED1(
     ShellViewHostMsg_SetShouldStayOnPageAfterHandlingBeforeUnload,
     bool /* should_stay_on_page */)
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_WaitUntilDone)