[Responsiveness] Add API to get the WebProcess ID

Author: magomez

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

@@ -5666,3 +5666,10 @@ gboolean webkit_web_view_is_web_process_responsive_finish(WebKitWebView* webView
 
     return g_task_propagate_boolean(G_TASK(result), error);
 }
+
+pid_t webkit_web_view_get_web_process_identifier(WebKitWebView *webView)
+{
+    g_return_val_if_fail(WEBKIT_IS_WEB_VIEW(webView), 0);
+
+    return getPage(webView).processID();
+}

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

@@ -1058,6 +1058,9 @@ webkit_web_view_is_web_process_responsive_finish     (WebKitWebView
                                                       GAsyncResult              *result,
                                                       GError                    **error);
 
+WEBKIT_API pid_t
+webkit_web_view_get_web_process_identifier           (WebKitWebView             *web_view);
+
 G_END_DECLS
 
 #endif