bug 419918 - Add the ability to fire the memory pressure observers from the embedding test app. Taken from Stuart's ramback extension and made available here for testing. r=dougt, sr=pavlov, a=beltzner

embedding/browser/gtk/tests/TestGtkEmbed.cpp

@@ -46,6 +46,11 @@
 #include "nsIDOMMouseEvent.h"
 #include "nsIDOMUIEvent.h"
 
+#include "nsCOMPtr.h"
+#include "nsISupportsUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIObserverService.h"
+
 #include "nsStringAPI.h"
 #include "gtkmozembed_glue.cpp"
 
@@ -57,6 +62,7 @@ typedef struct _TestGtkBrowser {
   GtkWidget  *fileMenu;
   GtkWidget  *fileOpenNewBrowser;
   GtkWidget  *fileStream;
+  GtkWidget  *fileMemory;
   GtkWidget  *fileClose;
   GtkWidget  *fileQuit;
   GtkWidget  *toolbarHBox;
@@ -107,6 +113,8 @@ static void     menu_open_new_cb   (GtkMenuItem *menuitem,
 				    TestGtkBrowser *browser);
 static void     menu_stream_cb     (GtkMenuItem *menuitem,
 				    TestGtkBrowser *browser);
+static void     menu_memory_cb     (GtkMenuItem *menuitem,
+				    TestGtkBrowser *browser);
 static void     menu_close_cb      (GtkMenuItem *menuitem,
 				    TestGtkBrowser *browser);
 static void     menu_quit_cb       (GtkMenuItem *menuitem,
@@ -328,6 +336,11 @@ new_gtk_browser(guint32 chromeMask)
   gtk_menu_append(GTK_MENU(browser->fileMenu),
 		  browser->fileStream);
 
+  browser->fileMemory =
+    gtk_menu_item_new_with_label("Release Memory");
+  gtk_menu_append(GTK_MENU(browser->fileMenu),
+		  browser->fileMemory);
+
   browser->fileClose =
     gtk_menu_item_new_with_label("Close");
   gtk_menu_append(GTK_MENU(browser->fileMenu),
@@ -465,6 +478,9 @@ new_gtk_browser(guint32 chromeMask)
   // hook up to the stream test
   gtk_signal_connect(GTK_OBJECT(browser->fileStream), "activate",
 		     GTK_SIGNAL_FUNC(menu_stream_cb), browser);
+  // hook up the memory pressure release function
+  gtk_signal_connect(GTK_OBJECT(browser->fileMemory), "activate",
+		     GTK_SIGNAL_FUNC(menu_memory_cb), browser);
   // close this window
   gtk_signal_connect(GTK_OBJECT(browser->fileClose), "activate",
 		     GTK_SIGNAL_FUNC(menu_close_cb), browser);
@@ -672,6 +688,21 @@ menu_stream_cb     (GtkMenuItem *menuitem, TestGtkBrowser *browser)
   gtk_moz_embed_close_stream(GTK_MOZ_EMBED(browser->mozEmbed));
 }
 
+void
+menu_memory_cb (GtkMenuItem *menuitem, TestGtkBrowser *browser)
+{
+  g_print("menu_memory_cb\n");
+  nsCOMPtr<nsIObserverService> os = do_GetService("@mozilla.org/observer-service;1");
+  if (!os)
+    return;
+
+  // Compact like you mean it.  We do this three times to give the
+  // cycle collector a chance to try and reclaim as much as we can.
+  os->NotifyObservers(nsnull, "memory-pressure", NS_LITERAL_STRING("heap-minimize").get());
+  os->NotifyObservers(nsnull, "memory-pressure", NS_LITERAL_STRING("heap-minimize").get());
+  os->NotifyObservers(nsnull, "memory-pressure", NS_LITERAL_STRING("heap-minimize").get());
+}
+
 void
 menu_close_cb (GtkMenuItem *menuitem, TestGtkBrowser *browser)
 {