Add scroll and gesture message filters for UIPI Flash.

Flash forwards some window messages when it has no handler set. The only ones I've observed are WM_MOUSEWHEEL, WM_APPCOMMAND (gestures are supported only on Win7). So, we need to allow these messages through the UIPI boundary.

One important note is that I use per-process message filters on Vista, but per-window filters on Win7 or later (because they're supported). 

BUG=86810
TEST=None.
Review URL: http://codereview.chromium.org/7617019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96876 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 9 insertions, 1 deletions

diff --git a/content/browser/plugin_process_host.cc b/content/browser/plugin_process_host.cc
index 0d0f009..722f046 100644
--- a/content/browser/plugin_process_host.cc
+++ b/content/browser/plugin_process_host.cc
@@ -45,6 +45,8 @@
 #endif
 
 #if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#include "webkit/plugins/npapi/plugin_constants_win.h"
 #include "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
 namespace {
@@ -58,6 +60,9 @@ void ReparentPluginWindowHelper(HWND window, HWND parent) {
 
   ::SetWindowLongPtr(window, GWL_STYLE, window_style);
   ::SetParent(window, parent);
+  // Allow the Flash plugin to forward some messages back to Chrome.
+  if (base::win::GetVersion() >= base::win::VERSION_WIN7)
+    ::SetPropW(parent, webkit::npapi::kNativeWindowClassFilterProp, HANDLE(-1));
 }
 
 }  // namespace
@@ -79,8 +84,11 @@ void PluginProcessHost::AddWindow(HWND window) {
 }
 
 void PluginProcessHost::OnReparentPluginWindow(HWND window, HWND parent) {
-  // Reparent only to our process.
+  // Reparent only from the plugin process to our process.
   DWORD process_id = 0;
+  ::GetWindowThreadProcessId(window, &process_id);
+  if (process_id != ::GetProcessId(GetChildProcessHandle()))
+    return;
   ::GetWindowThreadProcessId(parent, &process_id);
   if (process_id != ::GetCurrentProcessId())
     return;