Give SxS distribution its own registration GUIDs.

chrome/browser/ui/webui/options/browser_options_handler.cc

Index: chrome/browser/ui/webui/options/browser_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.cc b/chrome/browser/ui/webui/options/browser_options_handler.cc
index 99ef39a8ee2f2f7c19c61c232ff67027457e1ae4..161ffa844d75f8e5c1dea9d66425512da12c5dba 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.cc
+++ b/chrome/browser/ui/webui/options/browser_options_handler.cc
@@ -108,7 +108,9 @@
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_WIN)
+#include <windows.h>
 #include "chrome/installer/util/auto_launch_util.h"
+#include "chrome/installer/util/browser_distribution.h"
 #endif  // defined(OS_WIN)
 
 using content::BrowserContext;
@@ -761,6 +763,15 @@ void BrowserOptionsHandler::InitializeHandler() {
 
 void BrowserOptionsHandler::InitializePage() {
   page_initialized_ = true;
+#if defined(OS_WIN)
+  // On Windows, allow a magic key combination to enable SxS distributions to
+  // be set as the default browser.  This allows testing scenarios which were
+  // previously not possible on Windows 8.
+  if (GetAsyncKeyState(VK_SHIFT) && GetAsyncKeyState(VK_F12)) {
+    BrowserDistribution* dist = BrowserDistribution::GetDistribution();

[James Hawkins, 2013/08/26 21:19:09]

Why does this need to be in the settings page?

[zturner, 2013/08/26 21:31:18]

The full context of this is in the linked bug. It's marked as Restrict so I
think we should continue there if there are some high-level design concerns you
have.

That being said, the immediate reason for putting this in the settings page is
because we decided that the feature should be enabled if the user is holding
Shift+F12 while the settings page is loading.  I'll cc you on the bug.

+    dist->DebugEnableSetAsDefault();
+  }
+#endif
 
   OnTemplateURLServiceChanged();