(re-commit) Implement installation of the Chrome App Host.

chrome/installer/util/browser_distribution.cc

Index: chrome/installer/util/browser_distribution.cc
diff --git a/chrome/installer/util/browser_distribution.cc b/chrome/installer/util/browser_distribution.cc
index f958db84e1465fb694bc562ebc7cdc1212b9514b..b39ff59f2986dc030e4d93f0e31c17072ce1ef0c 100644
--- a/chrome/installer/util/browser_distribution.cc
+++ b/chrome/installer/util/browser_distribution.cc
@@ -17,10 +17,11 @@
 #include "base/win/registry.h"
 #include "base/win/windows_version.h"
 #include "chrome/common/env_vars.h"
+#include "chrome/installer/util/chrome_app_host_distribution.h"
 #include "chrome/installer/util/chrome_frame_distribution.h"
 #include "chrome/installer/util/chromium_binaries_distribution.h"
-#include "chrome/installer/util/google_chrome_distribution.h"
 #include "chrome/installer/util/google_chrome_binaries_distribution.h"
+#include "chrome/installer/util/google_chrome_distribution.h"
 #include "chrome/installer/util/google_chrome_sxs_distribution.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/l10n_string_util.h"
@@ -44,6 +45,7 @@ const wchar_t kICommandExecuteImplUuid[] =
 BrowserDistribution* g_browser_distribution = NULL;
 BrowserDistribution* g_chrome_frame_distribution = NULL;
 BrowserDistribution* g_binaries_distribution = NULL;
+BrowserDistribution* g_chrome_app_host_distribution = NULL;
 
 // Returns true if currently running in npchrome_frame.dll
 bool IsChromeFrameModule() {
@@ -54,6 +56,8 @@ bool IsChromeFrameModule() {
 }
 
 BrowserDistribution::Type GetCurrentDistributionType() {
+  // TODO(erikwright): If the app host is installed, but not Chrome, perhaps
+  // this should return CHROME_APP_HOST.
   static BrowserDistribution::Type type =
       (MasterPreferences::ForCurrentProcess().install_chrome_frame() ||
        IsChromeFrameModule()) ?
@@ -64,16 +68,6 @@ BrowserDistribution::Type GetCurrentDistributionType() {
 
 }  // end namespace
 
-// CHROME_BINARIES represents the binaries shared by multi-install products and
-// is not a product in and of itself, so it is not present in this collection.
-const BrowserDistribution::Type BrowserDistribution::kProductTypes[] = {
-  BrowserDistribution::CHROME_BROWSER,
-  BrowserDistribution::CHROME_FRAME,
-};
-
-const size_t BrowserDistribution::kNumProductTypes =
-    arraysize(BrowserDistribution::kProductTypes);
-
 BrowserDistribution::BrowserDistribution()
     : type_(CHROME_BROWSER) {
 }
@@ -126,6 +120,11 @@ BrowserDistribution* BrowserDistribution::GetSpecificDistribution(
           &g_chrome_frame_distribution);
       break;
 
+    case CHROME_APP_HOST:
+      dist = GetOrCreateBrowserDistribution<ChromeAppHostDistribution>(
+          &g_chrome_app_host_distribution);
+      break;
+
     default:
       DCHECK_EQ(CHROME_BINARIES, type);
 #if defined(GOOGLE_CHROME_BUILD)