Cancel prerenders for pages that call window.print()

chrome/common/render_messages.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.
 
 // Multiply-included file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 448 matching lines @@
                     int,                  /* page id */
                     std::string           /* the original language */,
                     std::string           /* the translated language */,
                     TranslateErrors::Type /* the error type if available */)
 
 // Message sent from the renderer to the browser to notify it of events which
 // may lead to the cancellation of a prerender. The message is sent only when
 // the renderer is prerendering.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_MaybeCancelPrerenderForHTML5Media)
 
+// Message sent from the renderer to the browser to notify it of a
+// window.print() call which should cancel the prerender. The message is sent
+// only when the renderer is prerendering.
+IPC_MESSAGE_ROUTED0(ViewHostMsg_CancelPrerenderForPrinting)
+
 // Sent by the renderer to check if a URL has permission to trigger a clipboard
 // read/write operation from the DOM.
 IPC_SYNC_MESSAGE_ROUTED1_1(ViewHostMsg_CanTriggerClipboardRead,
                            GURL /* url */,
                            bool /* allowed */)
 IPC_SYNC_MESSAGE_ROUTED1_1(ViewHostMsg_CanTriggerClipboardWrite,
                            GURL /* url */,
                            bool /* allowed */)
 
 // Suggest results -----------------------------------------------------------
 
 IPC_MESSAGE_ROUTED3(ViewHostMsg_SetSuggestions,
                     int32 /* page_id */,
                     std::vector<std::string> /* suggestions */,
                     InstantCompleteBehavior)
 
 IPC_MESSAGE_ROUTED2(ViewHostMsg_InstantSupportDetermined,
                     int32 /* page_id */,
                     bool  /* result */)
 
 // JavaScript related messages -----------------------------------------------
 
 // Notify the JavaScript engine in the render to change its parameters
 // while performing stress testing.
 IPC_MESSAGE_ROUTED2(ViewMsg_JavaScriptStressTestControl,
                     int /* cmd */,
                     int /* param */)