Added RenderView.DocumentHasImages query method

content/common/view_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 page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 1232 matching lines @@
                     IPC::PlatformFileForTransit /* file handle */)
 
 // Temporary message to diagnose an unexpected condition in WebContentsImpl.
 IPC_MESSAGE_CONTROL1(ViewMsg_TempCrashWithData,
                      GURL /* data */)
 
 // Change the accessibility mode in the renderer process.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetAccessibilityMode,
                     AccessibilityMode)
 
+// Request for the renderer to determine if the document contains any image
+// elements.  The id should be passed in the response message so the response
+// can be associated with the request.
+IPC_MESSAGE_ROUTED1(ViewMsg_DocumentHasImages,
+                    int /* id */)
+
 // -----------------------------------------------------------------------------
 // Messages sent from the renderer to the browser.
 
 // Sent by the renderer when it is creating a new window.  The browser creates
 // a tab for it and responds with a ViewMsg_CreatingNew_ACK.  If route_id is
 // MSG_ROUTING_NONE, the view couldn't be created.
 IPC_SYNC_MESSAGE_CONTROL1_3(ViewHostMsg_CreateWindow,
                             ViewHostMsg_CreateWindow_Params,
                             int /* route_id */,
                             int32 /* surface_id */,
@@ skipping 633 matching lines @@
 IPC_MESSAGE_ROUTED3(ViewHostMsg_UpdateZoomLimits,
                     int /* minimum_percent */,
                     int /* maximum_percent */,
                     bool /* remember */)
 
 // Notify the browser that this render process can or can't be suddenly
 // terminated.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_SuddenTerminationChanged,
                      bool /* enabled */)
 
+// Response to ViewMSg_DocumentHasImages request.
+IPC_MESSAGE_ROUTED2(ViewHostMsg_DocumentHasImagesResponse,
+                    int, /* id */
+                    bool /* has_images */)
+
 #if defined(OS_MACOSX)
 // On OSX, we cannot allocated shared memory from within the sandbox, so
 // this call exists for the renderer to ask the browser to allocate memory
 // on its behalf. We return a file descriptor to the POSIX shared memory.
 // If the |cache_in_browser| flag is |true|, then a copy of the shmem is kept
 // by the browser, and it is the caller's repsonsibility to send a
 // ViewHostMsg_FreeTransportDIB message in order to release the cached shmem.
 // In all cases, the caller is responsible for deleting the resulting
 // TransportDIB.
 IPC_SYNC_MESSAGE_CONTROL2_1(ViewHostMsg_AllocTransportDIB,
@@ skipping 188 matching lines @@
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     FilePath /* path */,
                     bool /* is_hung */)
 
 // Screen was rotated. Dispatched to the onorientationchange javascript API.
 IPC_MESSAGE_ROUTED1(ViewMsg_OrientationChangeEvent,
                     int /* orientation */)