First part of PAGE_TRANSITION_START_PAGE cleanup.

I replaced START_PAGE with AUTO_TOPLEVEL because that more accurately
describes how its being used in the code.  In a followed CL I will add
specific support for startup pages, which was the original intention of
START_PAGE.

This CL is basically a large search and replace and does not change the
behaviour of the code.

BUG=144002
TEST=No user visible change


Review URL: https://chromiumcodereview.appspot.com/10897034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@155047 0039d316-1c4b-4281-b951-d872f2087c98

39 files changed, 58 insertions, 50 deletions

diff --git a/ash/screensaver/screensaver_view.cc b/ash/screensaver/screensaver_view.cc
index 013024a..3c89e66 100644
--- a/ash/screensaver/screensaver_view.cc
+++ b/ash/screensaver/screensaver_view.cc
@@ -122,7 +122,7 @@ void ScreensaverView::LoadScreensaver() {
   screensaver_webview_->GetWebContents()->GetController().LoadURL(
         url_,
         content::Referrer(),
-        content::PAGE_TRANSITION_START_PAGE,
+        content::PAGE_TRANSITION_AUTO_TOPLEVEL,
         std::string());
 }
 
diff --git a/chrome/browser/autocomplete/autocomplete_browsertest.cc b/chrome/browser/autocomplete/autocomplete_browsertest.cc
index 8a41505..ca38c40 100644
--- a/chrome/browser/autocomplete/autocomplete_browsertest.cc
+++ b/chrome/browser/autocomplete/autocomplete_browsertest.cc
@@ -157,7 +157,7 @@ IN_PROC_BROWSER_TEST_F(AutocompleteBrowserTest, TabAwayRevertSelect) {
       content::NOTIFICATION_LOAD_STOP,
       content::NotificationService::AllSources());
   chrome::AddSelectedTabWithURL(browser(), GURL(chrome::kAboutBlankURL),
-                                content::PAGE_TRANSITION_START_PAGE);
+                                content::PAGE_TRANSITION_AUTO_TOPLEVEL);
   observer.Wait();
   EXPECT_EQ(UTF8ToUTF16(chrome::kAboutBlankURL), location_entry->GetText());
   chrome::CloseTab(browser());
diff --git a/chrome/browser/autofill/autofill_popup_view_browsertest.cc b/chrome/browser/autofill/autofill_popup_view_browsertest.cc
index 7fd9ced..9cad953 100644
--- a/chrome/browser/autofill/autofill_popup_view_browsertest.cc
+++ b/chrome/browser/autofill/autofill_popup_view_browsertest.cc
@@ -84,7 +84,7 @@ IN_PROC_BROWSER_TEST_F(AutofillPopupViewBrowserTest,
       content::NOTIFICATION_WEB_CONTENTS_VISIBILITY_CHANGED,
       content::Source<content::WebContents>(web_contents_));
   chrome::AddSelectedTabWithURL(browser(), GURL(chrome::kAboutBlankURL),
-                                content::PAGE_TRANSITION_START_PAGE);
+                                content::PAGE_TRANSITION_AUTO_TOPLEVEL);
   observer.Wait();
 
   // The mock verifies that the call was made.
diff --git a/chrome/browser/debugger/devtools_window.cc b/chrome/browser/debugger/devtools_window.cc
index f8a5d15..acd0e0d 100644
--- a/chrome/browser/debugger/devtools_window.cc
+++ b/chrome/browser/debugger/devtools_window.cc
@@ -181,7 +181,7 @@ DevToolsWindow* DevToolsWindow::Create(
   tab_contents->web_contents()->GetController().LoadURL(
       GetDevToolsUrl(profile, docked, shared_worker_frontend),
       content::Referrer(),
-      content::PAGE_TRANSITION_START_PAGE,
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
   return new DevToolsWindow(tab_contents, profile, inspected_rvh, docked);
 }
@@ -381,7 +381,7 @@ void DevToolsWindow::CreateDevToolsBrowser() {
 
   browser_ = new Browser(Browser::CreateParams::CreateForDevTools(profile_));
   browser_->tab_strip_model()->AddTabContents(
-      tab_contents_, -1, content::PAGE_TRANSITION_START_PAGE,
+      tab_contents_, -1, content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       TabStripModel::ADD_ACTIVE);
 }
 
diff --git a/chrome/browser/extensions/api/identity/identity_api.cc b/chrome/browser/extensions/api/identity/identity_api.cc
index aa3c12a..f3e5c2c 100644
--- a/chrome/browser/extensions/api/identity/identity_api.cc
+++ b/chrome/browser/extensions/api/identity/identity_api.cc
@@ -186,7 +186,7 @@ void IdentityGetAuthTokenFunction::ShowLoginPopup() {
                                                  true));
     chrome::NavigateParams params(browser,
                                   signin_url,
-                                  content::PAGE_TRANSITION_START_PAGE);
+                                  content::PAGE_TRANSITION_AUTO_TOPLEVEL);
     params.disposition = CURRENT_TAB;
     params.window_action = chrome::NavigateParams::SHOW_WINDOW;
     chrome::Navigate(&params);
diff --git a/chrome/browser/extensions/api/identity/web_auth_flow.cc b/chrome/browser/extensions/api/identity/web_auth_flow.cc
index e5f37d0..0a08e7e 100644
--- a/chrome/browser/extensions/api/identity/web_auth_flow.cc
+++ b/chrome/browser/extensions/api/identity/web_auth_flow.cc
@@ -98,7 +98,7 @@ void WebAuthFlow::Start() {
   controller->LoadURL(
       provider_url_,
       content::Referrer(),
-      content::PAGE_TRANSITION_START_PAGE,
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 }
 
diff --git a/chrome/browser/history/expire_history_backend.cc b/chrome/browser/history/expire_history_backend.cc
index 7089a38..39fa382 100644
--- a/chrome/browser/history/expire_history_backend.cc
+++ b/chrome/browser/history/expire_history_backend.cc
@@ -103,7 +103,7 @@ bool ShouldArchiveVisit(const VisitRow& visit) {
   // to see them.
   if (no_qualifier == content::PAGE_TRANSITION_TYPED ||
       no_qualifier == content::PAGE_TRANSITION_AUTO_BOOKMARK ||
-      no_qualifier == content::PAGE_TRANSITION_START_PAGE)
+      no_qualifier == content::PAGE_TRANSITION_AUTO_TOPLEVEL)
     return true;
 
   // Only archive these "less important" transitions when they were the final
diff --git a/chrome/browser/history/history_extension_api.cc b/chrome/browser/history/history_extension_api.cc
index 96d2e8a..687c79e 100644
--- a/chrome/browser/history/history_extension_api.cc
+++ b/chrome/browser/history/history_extension_api.cc
@@ -88,8 +88,8 @@ scoped_ptr<VisitItem> GetVisitItem(const history::VisitRow& row) {
     case content::PAGE_TRANSITION_GENERATED:
       transition = VisitItem::TRANSITION_GENERATED;
       break;
-    case content::PAGE_TRANSITION_START_PAGE:
-      transition = VisitItem::TRANSITION_START_PAGE;
+    case content::PAGE_TRANSITION_AUTO_TOPLEVEL:
+      transition = VisitItem::TRANSITION_AUTO_TOPLEVEL;
       break;
     case content::PAGE_TRANSITION_FORM_SUBMIT:
       transition = VisitItem::TRANSITION_FORM_SUBMIT;
diff --git a/chrome/browser/printing/print_preview_tab_controller.cc b/chrome/browser/printing/print_preview_tab_controller.cc
index 732792b..c943195 100644
--- a/chrome/browser/printing/print_preview_tab_controller.cc
+++ b/chrome/browser/printing/print_preview_tab_controller.cc
@@ -381,7 +381,7 @@ void PrintPreviewTabController::OnNavEntryCommitted(
 
       // New |preview_tab| is created. Don't update/erase map entry.
       if (waiting_for_new_preview_page_ &&
-          transition_type == content::PAGE_TRANSITION_START_PAGE &&
+          transition_type == content::PAGE_TRANSITION_AUTO_TOPLEVEL &&
           nav_type == content::NAVIGATION_TYPE_NEW_PAGE) {
         waiting_for_new_preview_page_ = false;
         SetInitiatorTabURLAndTitle(preview_tab);
diff --git a/chrome/browser/protector/session_startup_change.cc b/chrome/browser/protector/session_startup_change.cc
index d7d05b5..4a73756 100644
--- a/chrome/browser/protector/session_startup_change.cc
+++ b/chrome/browser/protector/session_startup_change.cc
@@ -210,7 +210,7 @@ void SessionStartupChange::OpenPinnedTabs(Browser* browser,
                                           const StartupTabs& tabs) {
   for (size_t i = 0; i < tabs.size(); ++i) {
     chrome::NavigateParams params(browser, tabs[i].url,
-                                  content::PAGE_TRANSITION_START_PAGE);
+                                  content::PAGE_TRANSITION_AUTO_TOPLEVEL);
     params.disposition = NEW_BACKGROUND_TAB;
     params.tabstrip_index = -1;
     params.tabstrip_add_types = TabStripModel::ADD_PINNED;
diff --git a/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc b/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
index a12ed72..7dd0cc4 100644
--- a/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
@@ -314,7 +314,7 @@ void SafeBrowsingBlockingPage::CommandReceived(const std::string& cmd) {
       web_contents_->GetController().LoadURL(
           GURL(chrome::kChromeUINewTabURL),
           content::Referrer(),
-          content::PAGE_TRANSITION_START_PAGE,
+          content::PAGE_TRANSITION_AUTO_TOPLEVEL,
           std::string());
     }
     return;
diff --git a/chrome/browser/sessions/session_restore.cc b/chrome/browser/sessions/session_restore.cc
index 3251656..3b54a79 100644
--- a/chrome/browser/sessions/session_restore.cc
+++ b/chrome/browser/sessions/session_restore.cc
@@ -985,7 +985,7 @@ class SessionRestoreImpl : public content::NotificationObserver {
         add_types |= TabStripModel::ADD_ACTIVE;
       int index = chrome::GetIndexForInsertionDuringRestore(browser, i);
       chrome::NavigateParams params(browser, urls[i],
-                                    content::PAGE_TRANSITION_START_PAGE);
+                                    content::PAGE_TRANSITION_AUTO_TOPLEVEL);
       params.disposition = i == 0 ? NEW_FOREGROUND_TAB : NEW_BACKGROUND_TAB;
       params.tabstrip_index = index;
       params.tabstrip_add_types = add_types;
diff --git a/chrome/browser/sync/glue/session_model_associator.cc b/chrome/browser/sync/glue/session_model_associator.cc
index 58dc3a6..7cfbc15 100644
--- a/chrome/browser/sync/glue/session_model_associator.cc
+++ b/chrome/browser/sync/glue/session_model_associator.cc
@@ -681,9 +681,9 @@ void SessionModelAssociator::PopulateSessionSpecificsNavigation(
       tab_navigation->set_page_transition(
         sync_pb::SyncEnums_PageTransition_GENERATED);
       break;
-    case content::PAGE_TRANSITION_START_PAGE:
+    case content::PAGE_TRANSITION_AUTO_TOPLEVEL:
       tab_navigation->set_page_transition(
-        sync_pb::SyncEnums_PageTransition_START_PAGE);
+        sync_pb::SyncEnums_PageTransition_AUTO_TOPLEVEL);
       break;
     case content::PAGE_TRANSITION_FORM_SUBMIT:
       tab_navigation->set_page_transition(
@@ -1253,8 +1253,8 @@ void SessionModelAssociator::AppendSessionTabNavigation(
       case sync_pb::SyncEnums_PageTransition_GENERATED:
         transition = content::PAGE_TRANSITION_GENERATED;
         break;
-      case sync_pb::SyncEnums_PageTransition_START_PAGE:
-        transition = content::PAGE_TRANSITION_START_PAGE;
+      case sync_pb::SyncEnums_PageTransition_AUTO_TOPLEVEL:
+        transition = content::PAGE_TRANSITION_AUTO_TOPLEVEL;
         break;
       case sync_pb::SyncEnums_PageTransition_FORM_SUBMIT:
         transition = content::PAGE_TRANSITION_FORM_SUBMIT;
diff --git a/chrome/browser/ui/browser_close_browsertest.cc b/chrome/browser/ui/browser_close_browsertest.cc
index 1fb8ae9..a56c4ac 100644
--- a/chrome/browser/ui/browser_close_browsertest.cc
+++ b/chrome/browser/ui/browser_close_browsertest.cc
@@ -174,7 +174,7 @@ class BrowserCloseTest : public InProcessBrowserTest {
   Browser* CreateBrowserOnProfile(Profile* profile) {
     Browser* new_browser = new Browser(Browser::CreateParams(profile));
     chrome::AddSelectedTabWithURL(new_browser, GURL(chrome::kAboutBlankURL),
-                                  content::PAGE_TRANSITION_START_PAGE);
+                                  content::PAGE_TRANSITION_AUTO_TOPLEVEL);
     content::WaitForLoadStop(chrome::GetActiveWebContents(new_browser));
     new_browser->window()->Show();
     return new_browser;
diff --git a/chrome/browser/ui/browser_navigator.cc b/chrome/browser/ui/browser_navigator.cc
index 0b41fda..6049b93 100644
--- a/chrome/browser/ui/browser_navigator.cc
+++ b/chrome/browser/ui/browser_navigator.cc
@@ -459,7 +459,7 @@ void Navigate(NavigateParams* params) {
       base_transition == content::PAGE_TRANSITION_TYPED ||
       base_transition == content::PAGE_TRANSITION_AUTO_BOOKMARK ||
       base_transition == content::PAGE_TRANSITION_GENERATED ||
-      base_transition == content::PAGE_TRANSITION_START_PAGE ||
+      base_transition == content::PAGE_TRANSITION_AUTO_TOPLEVEL ||
       base_transition == content::PAGE_TRANSITION_RELOAD ||
       base_transition == content::PAGE_TRANSITION_KEYWORD;
 
diff --git a/chrome/browser/ui/cocoa/web_dialog_window_controller.mm b/chrome/browser/ui/cocoa/web_dialog_window_controller.mm
index d74b1c7..2885d19 100644
--- a/chrome/browser/ui/cocoa/web_dialog_window_controller.mm
+++ b/chrome/browser/ui/cocoa/web_dialog_window_controller.mm
@@ -360,7 +360,7 @@ void WebDialogWindowDelegateBridge::HandleKeyboardEvent(
   tabContents_->web_contents()->GetController().LoadURL(
       delegate_->GetDialogContentURL(),
       content::Referrer(),
-      content::PAGE_TRANSITION_START_PAGE,
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 
   // TODO(akalin): add accelerator for ESC to close the dialog box.
diff --git a/chrome/browser/ui/cocoa/web_intent_picker_cocoa.mm b/chrome/browser/ui/cocoa/web_intent_picker_cocoa.mm
index acf5329..563a500 100644
--- a/chrome/browser/ui/cocoa/web_intent_picker_cocoa.mm
+++ b/chrome/browser/ui/cocoa/web_intent_picker_cocoa.mm
@@ -176,7 +176,7 @@ void WebIntentPickerCocoa::OnInlineDisposition(const string16& title,
   inline_disposition_tab_contents_->web_contents()->GetController().LoadURL(
       url,
       content::Referrer(),
-      content::PAGE_TRANSITION_START_PAGE,
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
   [sheet_controller_ setInlineDispositionTitle:
       base::SysUTF16ToNSString(title)];
diff --git a/chrome/browser/ui/extensions/application_launch.cc b/chrome/browser/ui/extensions/application_launch.cc
index d7acfa5..9af96e0 100644
--- a/chrome/browser/ui/extensions/application_launch.cc
+++ b/chrome/browser/ui/extensions/application_launch.cc
@@ -110,7 +110,7 @@ WebContents* OpenApplicationWindow(
     *app_browser = browser;
 
   TabContents* tab_contents = chrome::AddSelectedTabWithURL(
-      browser, url, content::PAGE_TRANSITION_START_PAGE);
+      browser, url, content::PAGE_TRANSITION_AUTO_TOPLEVEL);
   WebContents* contents = tab_contents->web_contents();
   contents->GetMutableRendererPrefs()->can_accept_load_drops = false;
   contents->GetRenderViewHost()->SyncRendererPrefs();
@@ -166,7 +166,7 @@ WebContents* OpenApplicationTab(Profile* profile,
   // TODO(erikkay): START_PAGE doesn't seem like the right transition in all
   // cases.
   chrome::NavigateParams params(browser, extension_url,
-                                content::PAGE_TRANSITION_START_PAGE);
+                                content::PAGE_TRANSITION_AUTO_TOPLEVEL);
   params.tabstrip_add_types = add_type;
   params.disposition = disposition;
 
diff --git a/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc b/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
index 14b4fe9..9b5e8ef 100644
--- a/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
+++ b/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
@@ -1340,7 +1340,7 @@ IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, MAYBE_NoIncognitoPrepopulate) {
       content::NOTIFICATION_LOAD_STOP,
       content::NotificationService::AllSources());
   chrome::AddSelectedTabWithURL(incognito_browser, url,
-                                content::PAGE_TRANSITION_START_PAGE);
+                                content::PAGE_TRANSITION_AUTO_TOPLEVEL);
   observer.Wait();
   incognito_browser->window()->Show();
 
diff --git a/chrome/browser/ui/gtk/web_dialog_gtk.cc b/chrome/browser/ui/gtk/web_dialog_gtk.cc
index 51c2a60..6452c62 100644
--- a/chrome/browser/ui/gtk/web_dialog_gtk.cc
+++ b/chrome/browser/ui/gtk/web_dialog_gtk.cc
@@ -215,7 +215,7 @@ gfx::NativeWindow WebDialogGtk::InitDialog() {
   tab_->web_contents()->GetController().LoadURL(
       GetDialogContentURL(),
       content::Referrer(),
-      content::PAGE_TRANSITION_START_PAGE,
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
   GtkDialogFlags flags = GTK_DIALOG_NO_SEPARATOR;
   if (delegate_->GetDialogModalType() != ui::MODAL_TYPE_NONE)
diff --git a/chrome/browser/ui/gtk/web_intent_picker_gtk.cc b/chrome/browser/ui/gtk/web_intent_picker_gtk.cc
index e6d579d..8ff01862 100644
--- a/chrome/browser/ui/gtk/web_intent_picker_gtk.cc
+++ b/chrome/browser/ui/gtk/web_intent_picker_gtk.cc
@@ -302,7 +302,7 @@ void WebIntentPickerGtk::OnInlineDisposition(const string16& title,
   tab_contents_container_->SetTab(inline_disposition_tab_contents_.get());
 
   inline_disposition_tab_contents_->web_contents()->GetController().LoadURL(
-      url, content::Referrer(), content::PAGE_TRANSITION_START_PAGE,
+      url, content::Referrer(), content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 
   // Replace the picker contents with the inline disposition.
diff --git a/chrome/browser/ui/intents/web_intent_inline_disposition_delegate.cc b/chrome/browser/ui/intents/web_intent_inline_disposition_delegate.cc
index bd4b38b..1b26737 100644
--- a/chrome/browser/ui/intents/web_intent_inline_disposition_delegate.cc
+++ b/chrome/browser/ui/intents/web_intent_inline_disposition_delegate.cc
@@ -54,7 +54,7 @@ content::WebContents* WebIntentInlineDispositionDelegate::OpenURLFromTab(
 
   // Load in place.
   source->GetController().LoadURL(params.url, content::Referrer(),
-      content::PAGE_TRANSITION_START_PAGE, std::string());
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL, std::string());
 
   // Remove previous history entries - users should not navigate in intents.
   source->GetController().PruneAllButActive();
diff --git a/chrome/browser/ui/panels/old_base_panel_browser_test.cc b/chrome/browser/ui/panels/old_base_panel_browser_test.cc
index fc7fa9e..a2b6501b 100644
--- a/chrome/browser/ui/panels/old_base_panel_browser_test.cc
+++ b/chrome/browser/ui/panels/old_base_panel_browser_test.cc
@@ -327,7 +327,7 @@ Panel* OldBasePanelBrowserTest::CreatePanelWithParams(
         content::NOTIFICATION_LOAD_STOP,
         content::NotificationService::AllSources());
     chrome::AddSelectedTabWithURL(panel_browser, params.url,
-                                  content::PAGE_TRANSITION_START_PAGE);
+                                  content::PAGE_TRANSITION_AUTO_TOPLEVEL);
     observer.Wait();
   }
 
diff --git a/chrome/browser/ui/startup/startup_browser_creator_impl.cc b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
index 61f6d69..8bafd9e 100644
--- a/chrome/browser/ui/startup/startup_browser_creator_impl.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
@@ -775,7 +775,7 @@ Browser* StartupBrowserCreatorImpl::OpenTabsInBrowser(Browser* browser,
     int index = chrome::GetIndexForInsertionDuringRestore(browser, i);
 
     chrome::NavigateParams params(browser, tabs[i].url,
-                                  content::PAGE_TRANSITION_START_PAGE);
+                                  content::PAGE_TRANSITION_AUTO_TOPLEVEL);
     params.disposition = first_tab ? NEW_FOREGROUND_TAB : NEW_BACKGROUND_TAB;
     params.tabstrip_index = index;
     params.tabstrip_add_types = add_types;
diff --git a/chrome/browser/ui/tabs/tab_strip_model.cc b/chrome/browser/ui/tabs/tab_strip_model.cc
index 127d0e5..3885ee8 100644
--- a/chrome/browser/ui/tabs/tab_strip_model.cc
+++ b/chrome/browser/ui/tabs/tab_strip_model.cc
@@ -55,7 +55,7 @@ bool ShouldForgetOpenersForTransition(content::PageTransition transition) {
       transition == content::PAGE_TRANSITION_AUTO_BOOKMARK ||
       transition == content::PAGE_TRANSITION_GENERATED ||
       transition == content::PAGE_TRANSITION_KEYWORD ||
-      transition == content::PAGE_TRANSITION_START_PAGE;
+      transition == content::PAGE_TRANSITION_AUTO_TOPLEVEL;
 }
 
 }  // namespace
diff --git a/chrome/browser/ui/tabs/tab_strip_model_unittest.cc b/chrome/browser/ui/tabs/tab_strip_model_unittest.cc
index 550d394..e5e9b83 100644
--- a/chrome/browser/ui/tabs/tab_strip_model_unittest.cc
+++ b/chrome/browser/ui/tabs/tab_strip_model_unittest.cc
@@ -1564,7 +1564,8 @@ TEST_F(TabStripModelTest, AddTabContents_NewTabAtEndOfStripInheritsGroup) {
 
   // Open page A
   TabContents* page_a_contents = CreateTabContents();
-  strip.AddTabContents(page_a_contents, -1, content::PAGE_TRANSITION_START_PAGE,
+  strip.AddTabContents(page_a_contents, -1,
+                       content::PAGE_TRANSITION_AUTO_TOPLEVEL,
                        TabStripModel::ADD_ACTIVE);
 
   // Open pages B, C and D in the background from links on page A...
@@ -1641,7 +1642,8 @@ TEST_F(TabStripModelTest, NavigationForgetsOpeners) {
 
   // Open page A
   TabContents* page_a_contents = CreateTabContents();
-  strip.AddTabContents(page_a_contents, -1, content::PAGE_TRANSITION_START_PAGE,
+  strip.AddTabContents(page_a_contents, -1,
+                       content::PAGE_TRANSITION_AUTO_TOPLEVEL,
                        TabStripModel::ADD_ACTIVE);
 
   // Open pages B, C and D in the background from links on page A...
@@ -1657,7 +1659,8 @@ TEST_F(TabStripModelTest, NavigationForgetsOpeners) {
 
   // Open page E in a different opener group from page A.
   TabContents* page_e_contents = CreateTabContents();
-  strip.AddTabContents(page_e_contents, -1, content::PAGE_TRANSITION_START_PAGE,
+  strip.AddTabContents(page_e_contents, -1,
+                       content::PAGE_TRANSITION_AUTO_TOPLEVEL,
                        TabStripModel::ADD_NONE);
 
   // Tell the TabStripModel that we are navigating page D via a link click.
@@ -1690,7 +1693,8 @@ TEST_F(TabStripModelTest, NavigationForgettingDoesntAffectNewTab) {
   // Open a tab and several tabs from it, then select one of the tabs that was
   // opened.
   TabContents* page_a_contents = CreateTabContents();
-  strip.AddTabContents(page_a_contents, -1, content::PAGE_TRANSITION_START_PAGE,
+  strip.AddTabContents(page_a_contents, -1,
+                       content::PAGE_TRANSITION_AUTO_TOPLEVEL,
                        TabStripModel::ADD_ACTIVE);
 
   TabContents* page_b_contents = CreateTabContents();
diff --git a/chrome/browser/ui/views/external_tab_container_win.cc b/chrome/browser/ui/views/external_tab_container_win.cc
index 5a960cb..a2b47a7 100644
--- a/chrome/browser/ui/views/external_tab_container_win.cc
+++ b/chrome/browser/ui/views/external_tab_container_win.cc
@@ -1111,7 +1111,7 @@ void ExternalTabContainerWin::Navigate(const GURL& url, const GURL& referrer) {
 
   tab_contents_->web_contents()->GetController().LoadURL(
       url, content::Referrer(referrer, WebKit::WebReferrerPolicyDefault),
-      content::PAGE_TRANSITION_START_PAGE, std::string());
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL, std::string());
 }
 
 bool ExternalTabContainerWin::OnGoToEntryOffset(int offset) {
diff --git a/chrome/browser/ui/views/web_intent_picker_views.cc b/chrome/browser/ui/views/web_intent_picker_views.cc
index 61d0a18..0c50753 100644
--- a/chrome/browser/ui/views/web_intent_picker_views.cc
+++ b/chrome/browser/ui/views/web_intent_picker_views.cc
@@ -1143,7 +1143,7 @@ void WebIntentPickerViews::OnInlineDisposition(
   web_contents->GetController().LoadURL(
       url,
       content::Referrer(),
-      content::PAGE_TRANSITION_START_PAGE,
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 
   // Disable all buttons and show throbber.
diff --git a/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc b/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc
index 9be55db..c9d9c4d 100644
--- a/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc
+++ b/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc
@@ -45,7 +45,7 @@ ConstrainedWebDialogDelegateBase::ConstrainedWebDialogDelegateBase(
 
   web_contents->GetController().LoadURL(delegate->GetDialogContentURL(),
                                         content::Referrer(),
-                                        content::PAGE_TRANSITION_START_PAGE,
+                                        content::PAGE_TRANSITION_AUTO_TOPLEVEL,
                                         std::string());
 }
 
diff --git a/chrome/common/extensions/api/history.json b/chrome/common/extensions/api/history.json
index b1d1b19..c72caee 100644
--- a/chrome/common/extensions/api/history.json
+++ b/chrome/common/extensions/api/history.json
@@ -30,7 +30,7 @@
           "referringVisitId": {"type": "string", "description": "The visit ID of the referrer."},
           "transition": {
             "type": "string",
-            "enum": ["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "start_page", "form_submit", "reload", "keyword", "keyword_generated"],
+            "enum": ["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "auto_toplevel", "form_submit", "reload", "keyword", "keyword_generated"],
             "description": "The <a href='#transition_types'>transition type</a> for this visit from its referrer."
           }
         }
diff --git a/chrome/common/extensions/docs/extensions/history.html b/chrome/common/extensions/docs/extensions/history.html
index 4ae5c58..c386a39 100644
--- a/chrome/common/extensions/docs/extensions/history.html
+++ b/chrome/common/extensions/docs/extensions/history.html
@@ -1666,7 +1666,7 @@ For other examples and for help in viewing the source code, see
                     <span id="typeTemplate">
                       <span>
                         <span>string</span>
-                        <span>["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "start_page", "form_submit", "reload", "keyword", "keyword_generated"]</span>
+                        <span>["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "auto_toplevel", "form_submit", "reload", "keyword", "keyword_generated"]</span>
                       </span>
                     </span>
                   )
diff --git a/chrome/common/metrics/metrics_log_base.cc b/chrome/common/metrics/metrics_log_base.cc
index e16b46d..5b12cfd 100644
--- a/chrome/common/metrics/metrics_log_base.cc
+++ b/chrome/common/metrics/metrics_log_base.cc
@@ -348,8 +348,8 @@ void MetricsLogBase::RecordLoadEvent(int window_id,
       origin_string = "global-history";
       break;
 
-    case content::PAGE_TRANSITION_START_PAGE:
-      origin_string = "start-page";
+    case content::PAGE_TRANSITION_AUTO_TOPLEVEL:
+      origin_string = "auto-toplevel";
       break;
 
     case content::PAGE_TRANSITION_FORM_SUBMIT:
diff --git a/chrome/test/base/in_process_browser_test.cc b/chrome/test/base/in_process_browser_test.cc
index f28dfa11..f683d00 100644
--- a/chrome/test/base/in_process_browser_test.cc
+++ b/chrome/test/base/in_process_browser_test.cc
@@ -277,7 +277,7 @@ void InProcessBrowserTest::AddBlankTabAndShow(Browser* browser) {
       content::NOTIFICATION_LOAD_STOP,
       content::NotificationService::AllSources());
   chrome::AddSelectedTabWithURL(browser, GURL(chrome::kAboutBlankURL),
-                                content::PAGE_TRANSITION_START_PAGE);
+                                content::PAGE_TRANSITION_AUTO_TOPLEVEL);
   observer.Wait();
 
   browser->window()->Show();
diff --git a/content/public/common/page_transition_types.cc b/content/public/common/page_transition_types.cc
index bc6b197..8063cf9 100644
--- a/content/public/common/page_transition_types.cc
+++ b/content/public/common/page_transition_types.cc
@@ -58,7 +58,7 @@ const char* PageTransitionGetCoreTransitionString(PageTransition type) {
     case PAGE_TRANSITION_AUTO_SUBFRAME: return "auto_subframe";
     case PAGE_TRANSITION_MANUAL_SUBFRAME: return "manual_subframe";
     case PAGE_TRANSITION_GENERATED: return "generated";
-    case PAGE_TRANSITION_START_PAGE: return "start_page";
+    case PAGE_TRANSITION_AUTO_TOPLEVEL: return "auto_toplevel";
     case PAGE_TRANSITION_FORM_SUBMIT: return "form_submit";
     case PAGE_TRANSITION_RELOAD: return "reload";
     case PAGE_TRANSITION_KEYWORD: return "keyword";
diff --git a/content/public/common/page_transition_types.h b/content/public/common/page_transition_types.h
index 14e80a6..7c46b79 100644
--- a/content/public/common/page_transition_types.h
+++ b/content/public/common/page_transition_types.h
@@ -57,8 +57,12 @@ enum PageTransition {
   // See also KEYWORD.
   PAGE_TRANSITION_GENERATED = 5,
 
-  // The page was specified in the command line or is the start page.
-  PAGE_TRANSITION_START_PAGE = 6,
+  // This is a toplevel navigation. This is any content that is automatically
+  // loaded in a toplevel frame.  For example, opening a tab to show the ASH
+  // screen saver, opening the devtools window, opening the NTP after the safe
+  // browsing warning, opening web-based dialog boxes are examples of
+  // AUTO_TOPLEVEL navigations.
+  PAGE_TRANSITION_AUTO_TOPLEVEL = 6,
 
   // The user filled out values in a form and submitted it. NOTE that in
   // some situations submitting a form does not result in this transition
diff --git a/sync/protocol/proto_enum_conversions.cc b/sync/protocol/proto_enum_conversions.cc
index d80b4e3..42d8ab5 100644
--- a/sync/protocol/proto_enum_conversions.cc
+++ b/sync/protocol/proto_enum_conversions.cc
@@ -43,7 +43,7 @@ const char* GetPageTransitionString(
     ENUM_CASE(sync_pb::SyncEnums, AUTO_SUBFRAME);
     ENUM_CASE(sync_pb::SyncEnums, MANUAL_SUBFRAME);
     ENUM_CASE(sync_pb::SyncEnums, GENERATED);
-    ENUM_CASE(sync_pb::SyncEnums, START_PAGE);
+    ENUM_CASE(sync_pb::SyncEnums, AUTO_TOPLEVEL);
     ENUM_CASE(sync_pb::SyncEnums, FORM_SUBMIT);
     ENUM_CASE(sync_pb::SyncEnums, RELOAD);
     ENUM_CASE(sync_pb::SyncEnums, KEYWORD);
diff --git a/sync/protocol/sync_enums.proto b/sync/protocol/sync_enums.proto
index 0842cff..f0381fc 100644
--- a/sync/protocol/sync_enums.proto
+++ b/sync/protocol/sync_enums.proto
@@ -43,7 +43,7 @@ message SyncEnums {
     AUTO_SUBFRAME = 3;
     MANUAL_SUBFRAME = 4;
     GENERATED = 5;
-    START_PAGE = 6;
+    AUTO_TOPLEVEL = 6;
     FORM_SUBMIT = 7;
     RELOAD = 8;
     KEYWORD = 9;
diff --git a/ui/views/controls/webview/webview.cc b/ui/views/controls/webview/webview.cc
index 74d24f4..9e5c722 100644
--- a/ui/views/controls/webview/webview.cc
+++ b/ui/views/controls/webview/webview.cc
@@ -66,7 +66,7 @@ void WebView::SetWebContents(content::WebContents* web_contents) {
 
 void WebView::LoadInitialURL(const GURL& url) {
   GetWebContents()->GetController().LoadURL(
-      url, content::Referrer(), content::PAGE_TRANSITION_START_PAGE,
+      url, content::Referrer(), content::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 }
 
diff --git a/ui/views/controls/webview/webview.h b/ui/views/controls/webview/webview.h
index e860d85..7c1d0dc 100644
--- a/ui/views/controls/webview/webview.h
+++ b/ui/views/controls/webview/webview.h
@@ -46,7 +46,7 @@ class WEBVIEW_EXPORT WebView : public View,
   // Loads the initial URL to display in the attached WebContents. Creates the
   // WebContents if none is attached yet. Note that this is intended as a
   // convenience for loading the initial URL, and so URLs are navigated with
-  // PAGE_TRANSITION_START_PAGE, so this is not intended as a general purpose
+  // PAGE_TRANSITION_AUTO_TOPLEVEL, so this is not intended as a general purpose
   // navigation method - use WebContents' API directly.
   void LoadInitialURL(const GURL& url);