Adds browser preferences to configure first-run flow on Windows 8.

chrome/common/pref_names.h

Index: chrome/common/pref_names.h
diff --git a/chrome/common/pref_names.h b/chrome/common/pref_names.h
index 8c6fdc908969dc36d0f300b6e116513b037f5dbd..871abd8af76ffa04ba4889c092bca0ef46ba2e57 100644
--- a/chrome/common/pref_names.h
+++ b/chrome/common/pref_names.h
@@ -307,7 +307,11 @@ extern const char kPluginsShowDetails[];
 extern const char kPluginsAllowOutdated[];
 extern const char kPluginsAlwaysAuthorize[];
 extern const char kCheckDefaultBrowser[];
-extern const char kDefaultBrowserFlowDialog[];
+extern const char kCheckDefaultBrowserOnFirstRun[];
+#if defined(OS_WIN)
+extern const char kDefaultBrowserFlowDialogEnabled[];
+extern const char kSuppressSwitchToMetroModeOnSetDefault[];

[grt (UTC plus 2), 2012/07/05 17:16:09]

is there a more precise definition for the desired feature than "Need to create
a flag that allows Chrome Win8 to launch in desktop mode on first run, even if
Chrome is selected as default browser." (issue 135255)?  i find it easy to
interpret that to be more broad than this one flag (for which i would have
written "Need to create a flag that suppresses the transition to metro mode when
Chrome is made the default browser during first run on Win8." in the feature
request).

[motek., 2012/07/05 20:22:26]

I can only second what you wrote. At first, I believed that this was an idea
equivalent to that setting in IE10, where you can have the browser launch in
Desktop, even if it is a default. 
I asked the person that entered the bug specifically about that and I got a
clarification, which resulted in what I coded. This has to do with some
partners' downloads, where they would rather not have their software disappear
from the view before the user had a chance to interact with it.

+#endif
 extern const char kDefaultBrowserSettingEnabled[];
 #if defined(OS_MACOSX)
 extern const char kShowUpdatePromotionInfoBar[];