Add support for distilling current WebContents

components/dom_distiller/content/web_contents_main_frame_observer.cc

Index: components/dom_distiller/content/web_contents_main_frame_observer.cc
diff --git a/components/dom_distiller/content/web_contents_main_frame_observer.cc b/components/dom_distiller/content/web_contents_main_frame_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ed1bbab54913297f32b046d9b02ff7f8bfdcaa22
--- /dev/null
+++ b/components/dom_distiller/content/web_contents_main_frame_observer.cc
@@ -0,0 +1,61 @@
+// 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 "components/dom_distiller/content/web_contents_main_frame_observer.h"
+
+#include "content/public/browser/navigation_details.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(dom_distiller::WebContentsMainFrameObserver);
+
+namespace dom_distiller {
+
+WebContentsMainFrameObserver::WebContentsMainFrameObserver(
+    content::WebContents* web_contents)
+    : is_document_loaded_in_main_frame_(false),
+      is_initialized_(false),
+      web_contents_(web_contents) {
+  content::WebContentsObserver::Observe(web_contents);
+}
+
+WebContentsMainFrameObserver::~WebContentsMainFrameObserver() {
+  CleanUp();
+}
+
+void WebContentsMainFrameObserver::DocumentLoadedInFrame(
+    int64 frame_id,
+    content::RenderViewHost* render_view_host) {
+  if (web_contents_ &&
+      frame_id == web_contents_->GetMainFrame()->GetRoutingID()) {
+    is_document_loaded_in_main_frame_ = true;
+  }
+}
+
+void WebContentsMainFrameObserver::DidNavigateMainFrame(
+    const content::LoadCommittedDetails& details,
+    const content::FrameNavigateParams& params) {
+  if (details.is_main_frame) {
+    is_document_loaded_in_main_frame_ = false;
+    is_initialized_ = true;
+  }
+}
+
+void WebContentsMainFrameObserver::RenderProcessGone(
+    base::TerminationStatus status) {
+  CleanUp();
+}
+
+void WebContentsMainFrameObserver::WebContentsDestroyed() {
+  CleanUp();
+}
+
+void WebContentsMainFrameObserver::CleanUp() {
+  content::WebContentsObserver::Observe(NULL);
+  web_contents_ = NULL;
+}
+
+}  // namespace dom_distiller