Revert "Revert of Expose distiller functions to JavaScript..."

components/dom_distiller/content/renderer/distiller_js_render_frame_observer.cc

Index: components/dom_distiller/content/renderer/distiller_js_render_frame_observer.cc
diff --git a/components/dom_distiller/content/renderer/distiller_js_render_frame_observer.cc b/components/dom_distiller/content/renderer/distiller_js_render_frame_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..27bf17590ca2f986988586c2a3786f0089fdb149
--- /dev/null
+++ b/components/dom_distiller/content/renderer/distiller_js_render_frame_observer.cc
@@ -0,0 +1,67 @@
+// Copyright 2015 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 "components/dom_distiller/content/renderer/distiller_js_render_frame_observer.h"
+
+#include "base/bind.h"
+#include "components/dom_distiller/content/common/distiller_page_notifier_service.mojom.h"
+#include "components/dom_distiller/content/renderer/distiller_page_notifier_service_impl.h"
+#include "content/public/common/service_registry.h"
+#include "content/public/renderer/render_frame.h"
+#include "v8/include/v8.h"
+
+namespace dom_distiller {
+
+DistillerJsRenderFrameObserver::DistillerJsRenderFrameObserver(
+    content::RenderFrame* render_frame,
+    const int distiller_isolated_world_id)
+    : RenderFrameObserver(render_frame),
+      distiller_isolated_world_id_(distiller_isolated_world_id),
+      is_distiller_page_(false),
+      weak_factory_(this) {}
+
+DistillerJsRenderFrameObserver::~DistillerJsRenderFrameObserver() {}
+
+void DistillerJsRenderFrameObserver::DidStartProvisionalLoad() {
+  RegisterMojoService();
+}
+
+void DistillerJsRenderFrameObserver::DidFinishLoad() {
+  // If no message about the distilled page was received at this point, there
+  // will not be one; remove the DistillerPageNotifierService from the registry.
+  render_frame()
+      ->GetServiceRegistry()
+      ->RemoveService<DistillerPageNotifierService>();
+}
+
+void DistillerJsRenderFrameObserver::DidCreateScriptContext(
+    v8::Local<v8::Context> context,
+    int extension_group,
+    int world_id) {
+  if (world_id != distiller_isolated_world_id_ || !is_distiller_page_) {
+    return;
+  }
+
+  native_javascript_handle_.reset(
+      new DistillerNativeJavaScript(render_frame()));
+  native_javascript_handle_->AddJavaScriptObjectToFrame(context);
+}
+
+void DistillerJsRenderFrameObserver::RegisterMojoService() {
+  render_frame()->GetServiceRegistry()->AddService(base::Bind(
+      &DistillerJsRenderFrameObserver::CreateDistillerPageNotifierService,
+      weak_factory_.GetWeakPtr()));
+}
+
+void DistillerJsRenderFrameObserver::CreateDistillerPageNotifierService(
+    mojo::InterfaceRequest<DistillerPageNotifierService> request) {
+  // This is strongly bound to and owned by the pipe.
+  new DistillerPageNotifierServiceImpl(this, request.Pass());
+}
+
+void DistillerJsRenderFrameObserver::SetIsDistillerPage() {
+  is_distiller_page_ = true;
+}
+
+}  // namespace dom_distiller