Add scroll and gesture message filters for UIPI Flash.

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
===================================================================
--- chrome/common/chrome_content_client.cc	(revision 96590)
+++ chrome/common/chrome_content_client.cc	(working copy)
@@ -362,6 +362,19 @@
     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) {

[M-A Ruel, 2011/08/12 23:50:05]

And what about Windows 7 and later? If it's vista specific, I think you should
mention it in the comment.

+      typedef BOOL (WINAPI *ChangeWindowMessageFilterFunction)(
+          UINT message,
+          DWORD flag);
+      static ChangeWindowMessageFilterFunction s_ChangeWindowMessageFilter =

[M-A Ruel, 2011/08/12 23:50:05]

Same

+          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.