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 234 matching lines @@
     ::AssignProcessToJobObject(job, process);
     // Yes, we are leaking the object here. Read comment above.
   } else {
     ::CloseHandle(job);
     return false;
   }
 
   ::CloseHandle(process);
   return true;
 }
+
+// Must be dynamically loaded to avoid startup failures on Win XP.
+typedef BOOL (WINAPI *ChangeWindowMessageFilterFunction)(
+    UINT message,
+    DWORD flag);
+ChangeWindowMessageFilterFunction g_ChangeWindowMessageFilter;
+
 #endif  // OS_WIN
 
 }  // namespace
 
 namespace chrome {
 
 const char* ChromeContentClient::kPDFPluginName = ::kPDFPluginName;
 const char* ChromeContentClient::kNaClPluginName = ::kNaClPluginName;
 
 void ChromeContentClient::SetActiveURL(const GURL& url) {
@@ skipping 90 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) {
+      if (!g_ChangeWindowMessageFilter) {
+        g_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
+      g_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