Split the field trial setup code into desktop and mobile files.

chrome/browser/chrome_browser_field_trials_mobile.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_MOBILE_H_
+#define CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_MOBILE_H_
+
+#include "base/basictypes.h"
+#include "base/time.h"
+
+class CommandLine;
+class PrefService;
+
+namespace chrome {
+
+// Sets up mobile-only field trials.
+// Add invocation of your field trial initialization code in this method.

[SteveT, 2013/04/19 14:33:49]

Did you want to include a comment here about how all-platform trials should go
in SetupFieldTrials in chrome_browser_field_trials.cc, to be consistent with the
Desktop comment?

[rohitrao (ping after 24h), 2013/04/19 14:42:58]

Copied the same comment from the desktop file.

+void SetupMobileFieldTrials(const CommandLine& parsed_command_line,
+                            const base::Time& install_time,
+                            PrefService* local_state);
+
+}  // end namespace chrome
+
+#endif  // CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_MOBILE_H_