Give SxS distribution its own registration GUIDs.

chrome/installer/util/browser_distribution.h

Index: chrome/installer/util/browser_distribution.h
diff --git a/chrome/installer/util/browser_distribution.h b/chrome/installer/util/browser_distribution.h
index b308c04fecddd8223de6ef11c97ae9dcd7f031a3..0296ef0a0de9f7a77a6f4f0eb543747e958fd6f9 100644
--- a/chrome/installer/util/browser_distribution.h
+++ b/chrome/installer/util/browser_distribution.h
@@ -89,6 +89,18 @@ class BrowserDistribution {
   // should be suffixed in all scenarios.
   virtual string16 GetBaseAppId();
 
+  // Returns the Browser ProgId prefix (e.g. ChromeHTML, ChromiumHTM, etc...).
+  // The full id is of the form |prefix|.|suffix| and is limited to a maximum
+  // length of 39 characters including null-terminator.  See
+  // http://msdn.microsoft.com/library/aa911706.aspx for details.  We define
+  // |suffix| as a fixed-length 26-character alphanumeric identifier, therefore
+  // the return value of this function should have a maximum length of
+  // 39 - 1(null-term) - 26(|suffix|) - 1(dot separator) = 11 characters.
+  virtual string16 GetBrowserProgIdPrefix();
+
+  // Returns the Browser ProgId description.
+  virtual string16 GetBrowserProgIdDesc();
+
   virtual string16 GetInstallSubDir();
 
   virtual string16 GetPublisherName();
@@ -117,8 +129,13 @@ class BrowserDistribution {
 
   virtual string16 GetVersionKey();
 
+  // Returns true if this distribution can be set as the default browser.
   virtual bool CanSetAsDefault();
 
+  // Forces CanSetAsDefault() to return true.  For distributions where
+  // IsSetAsDefaultSupported() returns false, this function is a no-op.
+  virtual void DebugEnableSetAsDefault();
+
   virtual bool CanCreateDesktopShortcuts();
 
   virtual bool GetChromeChannel(string16* channel);
@@ -126,7 +143,7 @@ class BrowserDistribution {
   // Returns true if this distribution includes a DelegateExecute verb handler,
   // and provides the CommandExecuteImpl class UUID if |handler_class_uuid| is
   // non-NULL.
-  virtual bool GetCommandExecuteImplClsid(string16* handler_class_uuid);
+  virtual bool GetCommandExecuteImplClsidString(string16* handler_class_uuid);

[grt (UTC plus 2), 2013/09/09 18:39:15]

please revert this to its original name to reduce needless code churn.

 
   // Returns true if this distribution uses app_host.exe to run platform apps.
   virtual bool AppHostIsSupported();