Bug 669200 - nsPluginNativeWindow(Gtk/Win) support for content process plugins. Involves disabling some obsolete code and fixing helper calls like CallSetWindow, which no longer have access to native resources. r=blassey

dom/plugins/base/nsPluginNativeWindowGtk.cpp

@@ -100,7 +100,13 @@ nsresult PLUG_DeletePluginNativeWindow(nsPluginNativeWindow * aPluginNativeWindo
 nsresult nsPluginNativeWindowGtk::CallSetWindow(nsRefPtr<nsNPAPIPluginInstance> &aPluginInstance)
 {
   if (aPluginInstance) {
-    if (type == NPWindowTypeWindow) {
+    if (type == NPWindowTypeWindow &&
+        XRE_GetProcessType() == GeckoProcessType_Content) {
+      // In this case, most of the initialization code here has already happened
+      // in the chrome process. The window we have in content is the XID of the
+      // socket widget we need to hand to plugins.
+      SetWindow((XID)window);
+	  } else if (type == NPWindowTypeWindow) {
       if (!mSocketWidget) {
         nsresult rv;
 
@@ -165,9 +171,9 @@ nsresult nsPluginNativeWindowGtk::CallSetWindow(nsRefPtr<nsNPAPIPluginInstance>
 #endif
     } // NPWindowTypeWindow
     aPluginInstance->SetWindow(this);
-  }
-  else if (mPluginInstance)
+  } else if (mPluginInstance) {
     mPluginInstance->SetWindow(nullptr);
+  }
 
   SetPluginInstance(aPluginInstance);
   return NS_OK;

dom/plugins/base/nsPluginNativeWindowWin.cpp

@@ -189,7 +189,14 @@ NS_IMETHODIMP nsDelayedPopupsEnabledEvent::Run()
 static LRESULT CALLBACK PluginWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 
 /**
- *   New plugin window procedure
+ * New plugin window procedure
+ *
+ * e10s note - this subclass, and the hooks we set below using WindowsDllInterceptor
+ * are currently not in use when running with e10s. (Utility calls like CallSetWindow
+ * are still in use in the content process.) We would like to keep things this away,
+ * essentially making all the hacks here obsolete. Some of the mitigation work here has
+ * already been supplanted by code in PluginInstanceChild. The rest we eventually want
+ * to rip out.
  */
 static LRESULT CALLBACK PluginWndProcInternal(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
@@ -601,6 +608,8 @@ nsresult nsPluginNativeWindowWin::CallSetWindow(nsRefPtr<nsNPAPIPluginInstance>
   // not interested in subclassing business any more, undo and don't subclass
   if (!aPluginInstance) {
     UndoSubclassAndAssociateWindow();
+    // release plugin instance
+    SetPluginInstance(nullptr);
     nsPluginNativeWindow::CallSetWindow(aPluginInstance);
     return NS_OK;
   }
@@ -621,6 +630,14 @@ nsresult nsPluginNativeWindowWin::CallSetWindow(nsRefPtr<nsNPAPIPluginInstance>
     }
   }
 
+  // With e10s we execute in the content process and as such we don't
+  // have access to native widgets. CallSetWindow and skip native widget
+  // subclassing.
+  if (XRE_GetProcessType() != GeckoProcessType_Default) {
+    nsPluginNativeWindow::CallSetWindow(aPluginInstance);
+    return NS_OK;
+  }
+
   if (window) {
     // grab the widget procedure before the plug-in does a subclass in
     // setwindow. We'll use this in PluginWndProc for forwarding focus
@@ -706,9 +723,6 @@ nsresult nsPluginNativeWindowWin::SubclassAndAssociateWindow()
 
 nsresult nsPluginNativeWindowWin::UndoSubclassAndAssociateWindow()
 {
-  // release plugin instance
-  SetPluginInstance(nullptr);
-
   // remove window property
   HWND hWnd = (HWND)window;
   if (IsWindow(hWnd))