Export a private webstore API to call into the new inline sign-in flow.

chrome/browser/ui/sync/one_click_signin_sync_observer.cc

+// 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 "chrome/browser/ui/sync/one_click_signin_sync_observer.h"
+
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/signin/signin_promo.h"
+#include "chrome/browser/sync/profile_sync_service.h"
+#include "chrome/browser/sync/profile_sync_service_factory.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+
+namespace {
+
+void CloseTab(content::WebContents* tab) {
+  content::WebContentsDelegate* tab_delegate = tab->GetDelegate();
+  if (tab_delegate)
+    tab_delegate->CloseContents(tab);
+}
+
+}  // namespace
+
+
+OneClickSigninSyncObserver::OneClickSigninSyncObserver(
+    content::WebContents* web_contents,
+    const GURL& continue_url)
+    : content::WebContentsObserver(web_contents),
+      continue_url_(continue_url) {
+  DCHECK(!continue_url_.is_empty());
+
+  ProfileSyncService* sync_service = GetSyncService(web_contents);
+  if (sync_service) {
+    sync_service->AddObserver(this);
+  } else {
+    LoadContinueUrl();
+    delete this;
+  }
+}
+
+OneClickSigninSyncObserver::~OneClickSigninSyncObserver() {}
+
+void OneClickSigninSyncObserver::WebContentsDestroyed(
+    content::WebContents* web_contents) {
+  ProfileSyncService* sync_service = GetSyncService(web_contents);
+  if (sync_service)
+    sync_service->RemoveObserver(this);
+
+  delete this;
+}
+
+void OneClickSigninSyncObserver::OnStateChanged() {
+  DLOG(WARNING) << "Reached OneClickSigninSyncObserver::OnStateChanged()";
+  ProfileSyncService* sync_service = GetSyncService(web_contents());
+
+  // At this point, the sign-in process is complete, and control has been handed
+  // back to the sync engine. Close the gaia sign in tab if the |continue_url_|
+  // contains the |auto_close| parameter. Otherwise, wait for sync setup to
+  // complete and then navigate to the |continue_url_|.
+  if (signin::IsAutoCloseEnabledInURL(continue_url_)) {
+    DLOG(WARNING) << "Auto-close is enabled in the continue url.";
+    // Close the Gaia sign-in tab via a task to make sure we aren't in the
+    // middle of any WebUI handler code.
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&CloseTab, base::Unretained(web_contents())));
+  } else {
+    DLOG(WARNING) << "Auto-close is not enabled in the continue url.";
+    if (sync_service->FirstSetupInProgress()) {
+      DLOG(WARNING) << "First setup is still in progress; return early.";
+      // Sync setup has not completed yet. Wait for it to complete.
+      return;
+    }
+
+    if (sync_service->sync_initialized() &&
+        signin::GetSourceForPromoURL(continue_url_)
+            != signin::SOURCE_SETTINGS) {
+      DLOG(WARNING) << "Initialized successfully!  Time to redirect to the continue URL.";

[guohui, 2014/03/24 20:55:58]

nits: 80 chars

[Ilya Sherman, 2014/03/26 08:21:39]

I'm not planning to commit these DLOG statements.  I left them in just to give
you full context about my comments on Patch Set 5.

+      // TODO(isherman): I'm seeing this case reached with the following STR:
+      // 0. Open a tab pointed to chrome://settings.
+      // 1. In a new tab, navigate to the Chrome Webstore.
+      // 2. Trigger the private API to sign in to Chrome.
+      // 3. Check the box to "Choose what to syc".
+      // 4. Enter username and password to sign in.
+      // 5. Wait for the current tab to be redirected to
+      //    chrome://settings/syncSetup
+      // 6. Close the original chrome://settings tab.
+      // 7. At this point, the current tab will redirect back to the Chrome
+      //    Webstore, even though the user hasn't actually configured Sync.
+      // I don't really understand why closing the first chrome://settings tab
+      // triggers an OnStateChanged() call.  Interestingly, the behavior is
+      // different from the case where the user clicks "Cancel" in the current
+      // tab that's showing the "Configure sync" dialog.  Also, this code
+      // doesn't seem to handle the case where the user opts to choose something
+      // other than "Sync everything".  Again, I don't know why -- it works fine
+      // for the "Sync everything" case, and it's unchanged from the
+      // pre-existing OneClickSigninHelper logic.  This is admittedly all a pile
+      // of edge-cases, but I'm worried that there might be a lot of these edge
+      // cases that add up to a bad user experience vs. opening a new tab that
+      // houses the "Configure sync" settings dialog.  WDYT?
+      LoadContinueUrl();
+    }
+
+    // TODO(isherman): What's the appropriate behavior if the user presses
+    // "Cancel" after opting to "Choose what to sync"?
+  }
+
+  DLOG(WARNING) << "Sync setup is done.  Removing self as an observer and dying.";

[guohui, 2014/03/24 20:55:58]

nits: 80 chars

+  sync_service->RemoveObserver(this);
+  delete this;
+}
+
+void OneClickSigninSyncObserver::LoadContinueUrl() {
+  web_contents()->GetController().LoadURL(
+      continue_url_,
+      content::Referrer(),
+      content::PAGE_TRANSITION_AUTO_TOPLEVEL,
+      std::string());
+}
+
+ProfileSyncService* OneClickSigninSyncObserver::GetSyncService(
+    content::WebContents* web_contents) {
+  Profile* profile =
+      Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  return ProfileSyncServiceFactory::GetForProfile(profile);
+}