Implement installation of the Chrome App Host.

chrome/installer/util/installer_state.h

Index: chrome/installer/util/installer_state.h
diff --git a/chrome/installer/util/installer_state.h b/chrome/installer/util/installer_state.h
index 5fe4fc8d40bb737bc3070b35c00ca16cbe27bee9..46edaf2667cd981ed35ac80ccc1b1974c8bc3e12 100644
--- a/chrome/installer/util/installer_state.h
+++ b/chrome/installer/util/installer_state.h
@@ -37,6 +37,12 @@ typedef std::vector<Product*> Products;
 
 // Encapsulates the state of the current installation operation.  Only valid
 // for installs and upgrades (not for uninstalls or non-install commands).
+// This class interprets the command-line arguments and master preferences and
+// determines the operations to be performed. For example, the Chrome Binaries
+// are automatically added if required in multi-install mode.
+// TODO(erikwright): This is now used a fair bit during uninstall, and
+// InstallerState::Initialize() contains a lot of code for uninstall. The class
+// comment should probably be updated.
 // TODO(grt): Rename to InstallerEngine/Conductor or somesuch?
 class InstallerState {
  public: