Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/renderer_host/navigator.cc

+// Copyright 2013 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 "content/browser/renderer_host/navigator.h"
+
+#include "content/browser/renderer_host/navigator_observer.h"
+#include "content/browser/renderer_host/render_frame_host_impl.h"
+#include "content/browser/site_instance_impl.h"
+#include "content/browser/web_contents/navigation_controller_impl.h"
+#include "content/browser/web_contents/navigation_entry_impl.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/invalidate_type.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/common/url_constants.h"
+
+namespace content {
+
+void Navigator::DidStartProvisionalLoad(
+    RenderFrameHost* render_frame_host,
+    int64 frame_id,
+    int64 parent_frame_id,
+    bool is_main_frame,
+    const GURL& url) {
+  bool is_error_page = (url.spec() == kUnreachableWebDataURL);
+  bool is_iframe_srcdoc = (url.spec() == kAboutSrcDocURL);
+  GURL validated_url(url);
+  RenderProcessHost* render_process_host =
+      render_frame_host->GetProcess();
+  RenderViewHost::FilterURL(render_process_host, false, &validated_url);
+
+  if (is_main_frame) {
+    // If there is no browser-initiated pending entry for this navigation and it
+    // is not for the error URL, create a pending entry using the current
+    // SiteInstance, and ensure the address bar updates accordingly.  We don't
+    // know the referrer or extra headers at this point, but the referrer will
+    // be set properly upon commit.
+    NavigationEntry* pending_entry = controller_->GetPendingEntry();
+    bool has_browser_initiated_pending_entry = pending_entry &&
+        !NavigationEntryImpl::FromNavigationEntry(pending_entry)->
+            is_renderer_initiated();
+    if (!has_browser_initiated_pending_entry && !is_error_page) {
+      NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
+          controller_->CreateNavigationEntry(validated_url,
+                                            content::Referrer(),
+                                            content::PAGE_TRANSITION_LINK,
+                                            true /* is_renderer_initiated */,
+                                            std::string(),
+                                            controller_->GetBrowserContext()));
+      render_frame_host->GetSiteInstance();
+      controller_->SetPendingEntry(entry);
+      observer_->NavigationStateChanged(content::INVALIDATE_TYPE_URL);
+    }
+  }
+
+  // Notify the observer about the start of the provisional load.
+  observer_->DidStartProvisionalLoad(
+      frame_id, parent_frame_id, is_main_frame, validated_url, is_error_page,
+      is_iframe_srcdoc, render_frame_host);
+
+  if (is_main_frame) {
+    // Notify the observer about the provisional change in the main frame URL.
+    observer_->ProvisionalChangeToMainFrameUrl(
+        validated_url, render_frame_host);
+  }
+}
+
+}  // namespace content