content: permissions: add plumbing to request permissions

content/child/permissions/permission_dispatcher_thread_proxy.cc

Index: content/child/permissions/permission_dispatcher_thread_proxy.cc
diff --git a/content/child/permissions/permission_dispatcher_thread_proxy.cc b/content/child/permissions/permission_dispatcher_thread_proxy.cc
index b679065465aa2ec2dc9a391e503e759f84947933..2407d3e59391252ef18e7b1bce4ac5bb64efcea4 100644
--- a/content/child/permissions/permission_dispatcher_thread_proxy.cc
+++ b/content/child/permissions/permission_dispatcher_thread_proxy.cc
@@ -68,6 +68,20 @@ void PermissionDispatcherThreadProxy::queryPermission(
                  WorkerTaskRunner::Instance()->CurrentWorkerId()));
 }
 
+void PermissionDispatcherThreadProxy::requestPermission(
+    blink::WebPermissionType type,
+    const blink::WebURL& origin,
+    blink::WebPermissionCallback* callback) {
+  main_thread_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&PermissionDispatcher::RequestPermissionForWorker,
+                 base::Unretained(permission_dispatcher_),
+                 type,
+                 origin.string().utf8(),
+                 base::Unretained(callback),
+                 WorkerTaskRunner::Instance()->CurrentWorkerId()));
+}
+
 void PermissionDispatcherThreadProxy::revokePermission(
     blink::WebPermissionType type,
     const blink::WebURL& origin,