Make application shortcuts point to app_host.exe, install App Host during app installation.

chrome/browser/extensions/crx_installer.cc

Index: chrome/browser/extensions/crx_installer.cc
diff --git a/chrome/browser/extensions/crx_installer.cc b/chrome/browser/extensions/crx_installer.cc
index 040e353d098d4a95f43a556f0f4e96a215968a18..c1a1ae72d3983ca4c38336abe3bc582ec210217d 100644
--- a/chrome/browser/extensions/crx_installer.cc
+++ b/chrome/browser/extensions/crx_installer.cc
@@ -20,6 +20,7 @@
 #include "base/utf_string_conversions.h"
 #include "base/version.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/app_host_installer.h"
 #include "chrome/browser/extensions/convert_user_script.h"
 #include "chrome/browser/extensions/convert_web_app.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
@@ -463,7 +464,7 @@ void CrxInstaller::ConfirmInstall() {
   } else {
     if (!BrowserThread::PostTask(
             BrowserThread::FILE, FROM_HERE,
-            base::Bind(&CrxInstaller::CompleteInstall, this)))
+            base::Bind(&CrxInstaller::BeginInstall, this)))
       NOTREACHED();
   }
   return;
@@ -472,7 +473,7 @@ void CrxInstaller::ConfirmInstall() {
 void CrxInstaller::InstallUIProceed() {
   if (!BrowserThread::PostTask(
           BrowserThread::FILE, FROM_HERE,
-          base::Bind(&CrxInstaller::CompleteInstall, this)))
+          base::Bind(&CrxInstaller::BeginInstall, this)))
     NOTREACHED();
 
   Release();  // balanced in ConfirmInstall().
@@ -500,9 +501,8 @@ void CrxInstaller::InstallUIAbort(bool user_initiated) {
   // should go to zero and we die. The destructor will clean up the temp dir.
 }
 
-void CrxInstaller::CompleteInstall() {
+void CrxInstaller::BeginInstall() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-
   if (!current_version_.empty()) {
     Version current_version(current_version_);
     if (current_version.CompareTo(*(extension_->version())) > 0) {
@@ -515,6 +515,25 @@ void CrxInstaller::CompleteInstall() {
     }
   }
 
+  app_host_installer::InstallAppHostIfNecessary(*extension_,
+      base::Bind(&CrxInstaller::OnAppHostInstallationComplete, this));
+}
+
+void CrxInstaller::OnAppHostInstallationComplete(bool success) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  if (!success) {
+    ReportFailureFromFileThread(

[grt (UTC plus 2), 2012/10/24 15:59:18]

nit: use less vertical space:
    ReportFailureFromFileThread(CrxInstallerError(
        l10n_util::GetStringUTF16(IDS_EXTENSION_APP_HOST_INSTALL_ERROR)));

[huangs, 2012/10/24 18:52:45]

Done.

+        CrxInstallerError(
+            l10n_util::GetStringUTF16(
+                IDS_EXTENSION_APP_HOST_INSTALL_ERROR)));
+    return;
+  }
+
+  CompleteInstall();
+}
+
+void CrxInstaller::CompleteInstall() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   // See how long extension install paths are.  This is important on
   // windows, because file operations may fail if the path to a file
   // exceeds a small constant.  See crbug.com/69693 .