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

chrome/installer/util/product.h

Index: chrome/installer/util/product.h
diff --git a/chrome/installer/util/product.h b/chrome/installer/util/product.h
index 4b4ec65ebea19a7cecc3499b2ae59fa601b04391..eabc3c9cc5be73417f86bef0f8b30fc3557986ec 100644
--- a/chrome/installer/util/product.h
+++ b/chrome/installer/util/product.h
@@ -56,6 +56,14 @@ class Product {
     return distribution_->GetType() == BrowserDistribution::CHROME_FRAME;
   }
 
+  bool is_chrome_app_host() const {
+    return distribution_->GetType() == BrowserDistribution::CHROME_APP_HOST;
+  }
+
+  bool is_chrome_binaries() const {
+    return distribution_->GetType() == BrowserDistribution::CHROME_BINARIES;
+  }
+
   bool HasOption(const std::wstring& option) const {
     return options_.find(option) != options_.end();
   }