Make --install-chrome-app use extensions::WebstoreInstallWithPrompt.

chrome/browser/apps/install_chrome_app.cc

Index: chrome/browser/apps/install_chrome_app.cc
diff --git a/chrome/browser/apps/install_chrome_app.cc b/chrome/browser/apps/install_chrome_app.cc
index 57965bfd99732686b1a57b86ba54fb07adf99514..a11797dc5a5f3e61c4ae80b38e78cd195813bb00 100644
--- a/chrome/browser/apps/install_chrome_app.cc
+++ b/chrome/browser/apps/install_chrome_app.cc
@@ -8,79 +8,28 @@
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/webstore_startup_installer.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
-#include "chrome/browser/ui/browser_navigator.h"
+#include "chrome/common/extensions/webstore_install_result.h"
+#include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension.h"
-#include "google_apis/gaia/gaia_urls.h"
-#include "net/url_request/url_fetcher.h"
-#include "net/url_request/url_fetcher_delegate.h"
 
 namespace {
 
-// The URL to the webstore page for a specific app. "_asi=1" instructs webstore
-// to immediately try to install the app if the referrer is the sign in page.
-// This is actually the short form of the URL which just redirects to the full
-// URL. Since "_asi=1" only works on the full url, we need to resolve it first
-// before navigating the user to it.
+// The URL to the webstore page for a specific app.
 const char kWebstoreUrlFormat[] =
-    "https://chrome.google.com/webstore/detail/%s?_asi=1";
-
-// The URL for the sign in page, set as the referrer to webstore.
-const char kAccountsUrl[] = "https://accounts.google.com/ServiceLogin";
+    "https://chrome.google.com/webstore/detail/%s";
 
 // Returns the webstore URL for an app.
 GURL GetAppInstallUrl(const std::string& app_id) {
   return GURL(base::StringPrintf(kWebstoreUrlFormat, app_id.c_str()));
 }
 
-void NavigateToUrlWithAccountsReferrer(const GURL& url) {
-  Browser* browser =
-      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->get(0);
-  if (!browser)
-    return;
-
-  chrome::NavigateParams params(
-      browser, url, content::PAGE_TRANSITION_AUTO_TOPLEVEL);
-  params.disposition = NEW_FOREGROUND_TAB;
-  params.window_action = chrome::NavigateParams::SHOW_WINDOW;
-  params.referrer = content::Referrer();
-  params.referrer.url = GURL(kAccountsUrl);
-  chrome::Navigate(&params);
-}
-
-class AppURLFetcher : net::URLFetcherDelegate {
- public:
-  explicit AppURLFetcher(const std::string& app_id);
-
-  // net::URLFetcherDelegate OVERRIDES:
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
-
- private:
-  virtual ~AppURLFetcher();
-
-  scoped_ptr<net::URLFetcher> url_fetcher_;
-
-  DISALLOW_COPY_AND_ASSIGN(AppURLFetcher);
-};
-
-AppURLFetcher::AppURLFetcher(const std::string& app_id) {
-  url_fetcher_.reset(net::URLFetcher::Create(
-      GetAppInstallUrl(app_id), net::URLFetcher::GET, this));
-  url_fetcher_->SetRequestContext(g_browser_process->system_request_context());
-  url_fetcher_->SetStopOnRedirect(true);
-  url_fetcher_->Start();
-}
-
-AppURLFetcher::~AppURLFetcher() {
-}
-
-void AppURLFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
-  if (source->GetResponseCode() == 301) {
-    // Moved permanently.
-    NavigateToUrlWithAccountsReferrer(source->GetURL());
-  }
-
-  delete this;
+void DoNothingCallback(bool success,
+                       const std::string& error,
+                       extensions::webstore_install::Result result) {
 }
 
 }  // namespace
@@ -91,7 +40,31 @@ void InstallChromeApp(const std::string& app_id) {
   if (!extensions::Extension::IdIsValid(app_id))
     return;
 
-  new AppURLFetcher(app_id);
+  Browser* browser =
+      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->get(0);

[tapted, 2014/07/28 03:41:04]

I don't think BrowserList::get() can ever return NULL, but you might need to
check BrowserList->empty() before calling get()?

What happens if chrome is running, but has no browser windows open (e.g.
background mode / hangouts), and you execute this via the process singleton?
(should we allocate a new browser for that case?)

[jackhou1, 2014/07/28 04:18:53]

At the moment it's not an issue, but that might change. Added a comment.

+  if (!browser)
+    return;
+
+  content::OpenURLParams params(GetAppInstallUrl(app_id),
+                                content::Referrer(),
+                                NEW_FOREGROUND_TAB,
+                                content::PAGE_TRANSITION_AUTO_TOPLEVEL,
+                                false);
+  browser->OpenURL(params);
+
+  extensions::ExtensionRegistry* registry =

[tapted, 2014/07/28 03:41:04]

nit: maybe `using extensions::ExtensionRegistry`? 

[jackhou1, 2014/07/28 04:18:53]

Done.

+      extensions::ExtensionRegistry::Get(browser->profile());
+  const extensions::Extension* installed_extension = registry->GetExtensionById(
+      app_id,
+      extensions::ExtensionRegistry::ENABLED |
+          extensions::ExtensionRegistry::BLACKLISTED);

[tapted, 2014/07/28 03:41:04]

This probably needs a comment to explain this flag choice. And, e.g. to note why
the UX works if the extension is disabled or terminated. If the UX works that is
:) - I'm not sure.

[jackhou1, 2014/07/28 04:18:53]

Done.

+  if (installed_extension)
+    return;

[tapted, 2014/07/28 03:41:04]

Maybe a TODO(..) determine UX for an installed extension?

[jackhou1, 2014/07/28 04:18:53]

Done.

+
+  extensions::WebstoreStartupInstaller* installer =
+      new extensions::WebstoreStartupInstaller(
+          app_id, browser->profile(), true, base::Bind(&DoNothingCallback));
+  installer->BeginInstall();
 }
 
 }  // namespace install_chrome_app