Add API to send memory pressure events

Author: magomez

Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp

@@ -5872,3 +5872,10 @@ pid_t webkit_web_view_get_web_process_identifier(WebKitWebView *webView)
 
     return getPage(webView).legacyMainFrameProcessID();
 }
+
+void webkit_web_view_send_memory_pressure_event(WebKitWebView *webView, gboolean critical)
+{
+    g_return_if_fail(WEBKIT_IS_WEB_VIEW(webView));
+
+    getPage(webView).sendMemoryPressureEvent(critical);
+}

Source/WebKit/UIProcess/API/glib/WebKitWebView.h.in

@@ -1076,6 +1076,10 @@ webkit_web_view_is_web_process_responsive_finish     (WebKitWebView
 WEBKIT_API pid_t
 webkit_web_view_get_web_process_identifier           (WebKitWebView             *web_view);
 
+WEBKIT_API void
+webkit_web_view_send_memory_pressure_event           (WebKitWebView               *web_view,
+                                                      gboolean                    critical);
+
 G_END_DECLS
 
 #endif

Source/WebKit/UIProcess/WebPageProxy.cpp

@@ -16554,6 +16554,12 @@ Ref<AboutSchemeHandler> WebPageProxy::protectedAboutSchemeHandler()
     return m_aboutSchemeHandler;
 }
 
+void WebPageProxy::sendMemoryPressureEvent(bool critical) const
+{
+    for (auto& processPool : WebProcessPool::allProcessPools())
+        processPool->sendMemoryPressureEvent(critical);
+}
+
 } // namespace WebKit
 
 #undef WEBPAGEPROXY_RELEASE_LOG

Source/WebKit/UIProcess/WebPageProxy.h

@@ -2562,6 +2562,8 @@ class WebPageProxy final : public API::ObjectImpl<API::Object::Type::Page>, publ
 
     WebPageProxyMessageReceiverRegistration& messageReceiverRegistration();
 
+    void sendMemoryPressureEvent(bool critical) const;
+
 #if HAVE(ESIM_AUTOFILL_SYSTEM_SUPPORT)
     bool shouldAllowAutoFillForCellularIdentifiers() const;
 #endif