Add scroll and gesture message filters for UIPI Flash.

chrome/common/chrome_content_client.cc

 // 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.
 
 #include "chrome/common/chrome_content_client.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
@@ skipping 344 matching lines @@
   if (result != sandbox::SBOX_ALL_OK) {
     NOTREACHED();
     return false;
   }
 
   // Spawn the flash broker and apply sandbox policy.
   if (LoadFlashBroker(plugin_path, command_line)) {
     policy->SetJobLevel(sandbox::JOB_UNPROTECTED, 0);
     policy->SetTokenLevel(sandbox::USER_RESTRICTED_SAME_ACCESS,
                           sandbox::USER_INTERACTIVE);
+    // Allow the Flash plugin to forward some messages back to Chrome.
+    if (base::win::GetVersion() == base::win::VERSION_VISTA) {
+      typedef BOOL (WINAPI *ChangeWindowMessageFilterFunction)(
+          UINT message,
+          DWORD flag);
+      static ChangeWindowMessageFilterFunction s_ChangeWindowMessageFilter =
+          reinterpret_cast<ChangeWindowMessageFilterFunction>(
+              ::GetProcAddress(::GetModuleHandle(L"user32.dll"),
+                               "ChangeWindowMessageFilter"));
+      // Per-window message filters required on Win7 or later must be added to:
+      // render_widget_host_view_win.cc RenderWidgetHostViewWin::ReparentWindow
+      s_ChangeWindowMessageFilter(WM_MOUSEWHEEL, MSGFLT_ADD);
+    }
     policy->SetIntegrityLevel(sandbox::INTEGRITY_LEVEL_LOW);
   } else {
     // Could not start the broker, use a very weak policy instead.
     DLOG(WARNING) << "Failed to start flash broker";
     policy->SetJobLevel(sandbox::JOB_UNPROTECTED, 0);
     policy->SetTokenLevel(
         sandbox::USER_UNPROTECTED, sandbox::USER_UNPROTECTED);
   }
 
   return true;
 }
 #endif
 
 }  // namespace chrome