Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/frame_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/frame_host/navigator.h"
 
+#include "content/browser/frame_host/frame_tree_node.h"
+#include "content/browser/frame_host/navigation_controller_impl.h"
+#include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/frame_host/navigator_delegate.h"
+#include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/site_instance_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 {
 
 Navigator::Navigator(
     NavigationControllerImpl* nav_controller,
     NavigatorDelegate* delegate)
     : controller_(nav_controller),
       delegate_(delegate) {
 }
 
+void Navigator::DidStartProvisionalLoad(
+    RenderFrameHostImpl* 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.
+    NavigationEntryImpl* pending_entry =
+        NavigationEntryImpl::FromNavigationEntry(
+            controller_->GetPendingEntry());
+    bool has_browser_initiated_pending_entry = pending_entry &&
+        !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()));
+      entry->set_site_instance(
+          static_cast<SiteInstanceImpl*>(
+              render_frame_host->render_view_host()->GetSiteInstance()));
+      // TODO(creis): If there's a pending entry already, find a safe way to
+      // update it instead of replacing it and copying over things like this.
+      if (pending_entry) {
+        entry->set_transferred_global_request_id(
+            pending_entry->transferred_global_request_id());
+        entry->set_should_replace_entry(pending_entry->should_replace_entry());
+        entry->set_redirect_chain(pending_entry->redirect_chain());
+      }
+      controller_->SetPendingEntry(entry);
+      if (delegate_)
+        delegate_->NotifyChangedNavigationState(content::INVALIDATE_TYPE_URL);
+    }
+  }
+
+  if (delegate_) {
+    // Notify the observer about the start of the provisional load.
+    delegate_->DidStartProvisionalLoad(

[awong, 2013/11/22 02:35:51]

Random thought (take it or leave it)...do we want the delegate to have exactly
the same function name as what we're enacting here?  Or do we want something
like OnDidStartProvisionLoad or DidStartProvisionLoadComplete or something?

Mostly trying to avoid namespace collisions.

[nasko, 2013/11/22 15:19:30]

Those are different classes, so I'm not sure I understand the name collision
argument. One of the things that makes code reading harder for me in the current
codebase is that each class has a slight variation of the name, so not quite
sure which does what. I prefer to keep it this way.

+        render_frame_host, frame_id, parent_frame_id, is_main_frame,
+        validated_url, is_error_page, is_iframe_srcdoc);
+  }
+}
+
 }  // namespace content