Surface button for loading stale cache copy on net error page.

chrome/renderer/net/error_page_helper_functions.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "error_page_helper_functions.h"

[mmenke, 2014/04/09 15:59:26]

Use full path.

[Randy Smith (Not in Mondays), 2014/04/10 21:51:01]

Ooops; done.

+
+#include "base/strings/string_util.h"

[mmenke, 2014/04/09 15:59:26]

Is this needed?  Or just base/strings/string_piece.h?

[Randy Smith (Not in Mondays), 2014/04/10 21:51:01]

Done.

+#include "chrome/renderer/net/net_error_helper.h"
+#include "content/public/renderer/render_frame.h"
+#include "gin/handle.h"
+#include "gin/object_template_builder.h"
+#include "third_party/WebKit/public/platform/WebURLRequest.h"
+#include "third_party/WebKit/public/web/WebDataSource.h"

[mmenke, 2014/04/09 15:59:26]

Are either of these two needed?

[Randy Smith (Not in Mondays), 2014/04/10 21:51:01]

Nope; the refactor into NEHC removed these references.  Thanks for the catch. 
Done.

+#include "third_party/WebKit/public/web/WebFrame.h"
+#include "third_party/WebKit/public/web/WebKit.h"
+
+gin::WrapperInfo ErrorPageHelperFunctions::kWrapperInfo = {
+    gin::kEmbedderNativeGin};
+
+// static
+void ErrorPageHelperFunctions::Install(content::RenderFrame* render_frame,
+                                       const GURL& page_url) {
+  v8::Isolate* isolate = blink::mainThreadIsolate();
+  v8::HandleScope handle_scope(isolate);
+  v8::Handle<v8::Context> context =
+      render_frame->GetWebFrame()->mainWorldScriptContext();
+  if (context.IsEmpty())

[mmenke, 2014/04/09 15:59:26]

Can this happen?

[Randy Smith (Not in Mondays), 2014/04/10 21:51:01]

So this code was cut&pasted from DomAutomationController, so I don't know :-}. 
I don't personally see how it could be, and would be happy to move it to a
DCHECK for that reason.  Jochen?

[jochen (gone - plz use gerrit), 2014/04/14 13:11:53]

If JavaScript is disabled by content settings, this can happen.

+    return;
+
+  v8::Context::Scope context_scope(context);
+
+  gin::Handle<ErrorPageHelperFunctions> controller = gin::CreateHandle(
+      isolate, new ErrorPageHelperFunctions(render_frame, page_url));
+  v8::Handle<v8::Object> global = context->Global();
+  global->Set(gin::StringToV8(isolate, "helperFunctions"), controller.ToV8());
+}
+
+bool ErrorPageHelperFunctions::LoadStaleButtonClick() {
+  if (!render_frame_)

[Elly Fong-Jones, 2014/04/10 17:15:37]

can this object outlive the render_frame_?

[Randy Smith (Not in Mondays), 2014/04/10 21:51:01]

I'm going based on Jochen's comment in
https://codereview.chromium.org/140083004/diff/40001/chrome/renderer/net/erro...,
which says "Yes".  I can't tell you why, though; maybe it's just independent
lifetimes.

[jochen (gone - plz use gerrit), 2014/04/14 13:11:53]

Right, the javascript wrapper is destroyed via garbage collection which can be
delayed beyond the lifetime of the render frame

+    return false;
+
+  NetErrorHelper* net_error_helper =
+      content::RenderFrameObserverTracker<NetErrorHelper>::Get(render_frame_);
+  DCHECK(net_error_helper);
+  net_error_helper->LoadStaleButtonPressed();
+
+  return true;
+}
+
+bool ErrorPageHelperFunctions::ReloadButtonClick() {
+  if (!render_frame_)
+    return false;
+
+  NetErrorHelper* net_error_helper =
+      content::RenderFrameObserverTracker<NetErrorHelper>::Get(render_frame_);
+  DCHECK(net_error_helper);
+  net_error_helper->ReloadButtonPressed();
+
+  return true;
+}
+
+bool ErrorPageHelperFunctions::MoreButtonClick() {
+  if (!render_frame_)
+    return false;
+
+  NetErrorHelper* net_error_helper =
+      content::RenderFrameObserverTracker<NetErrorHelper>::Get(render_frame_);
+  DCHECK(net_error_helper);
+  net_error_helper->MoreButtonPressed();
+
+  return true;
+}
+
+ErrorPageHelperFunctions::ErrorPageHelperFunctions(
+    content::RenderFrame* render_frame,
+    const GURL& page_url)
+    : RenderFrameObserver(render_frame),
+      render_frame_(render_frame),
+      page_url_(page_url) {}
+
+ErrorPageHelperFunctions::~ErrorPageHelperFunctions() {}
+
+gin::ObjectTemplateBuilder ErrorPageHelperFunctions::GetObjectTemplateBuilder(
+    v8::Isolate* isolate) {
+  return gin::Wrappable<ErrorPageHelperFunctions>::GetObjectTemplateBuilder(
+             isolate)
+      .SetMethod("loadStaleButtonClick",
+                 &ErrorPageHelperFunctions::LoadStaleButtonClick)
+      .SetMethod("reloadButtonClick",
+                 &ErrorPageHelperFunctions::ReloadButtonClick)
+      .SetMethod("moreButtonClick",
+                 &ErrorPageHelperFunctions::MoreButtonClick);
+}
+
+void ErrorPageHelperFunctions::OnDestruct() { render_frame_ = NULL; }