Setup field trial for one-click signin inforbar.

chrome/browser/api/infobars/one_click_signin_infobar_delegate.h

Index: chrome/browser/api/infobars/one_click_signin_infobar_delegate.h
diff --git a/chrome/browser/api/infobars/one_click_signin_infobar_delegate.h b/chrome/browser/api/infobars/one_click_signin_infobar_delegate.h
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+// Copyright (c) 2012 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_API_INFOBARS_ONE_CLICK_SIGNIN_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_API_INFOBARS_ONE_CLICK_SIGNIN_INFOBAR_DELEGATE_H_
+
+#include "chrome/browser/api/infobars/confirm_infobar_delegate.h"
+#include "third_party/skia/include/core/SkColor.h"
+
+// An interface derived from ConfirmInfoBarDelegate implemented for the
+// one-click sign in inforbar experiments.
+class OneClickSigninInfoBarDelegate : public ConfirmInfoBarDelegate {
+ public:
+  // A set of alternate colours for the experiment.  The colour values are only
+  // used if |enabled| is true.  Otherwise the infobar uses its default colours.
+  struct AlternateColors {
+    bool enabled;
+    SkColor infobar_top_color;
+    SkColor infobar_bottom_color;
+    SkColor button_text_color;
+    SkColor button_background_color;
+    SkColor button_border_color;
+  };
+
+  explicit OneClickSigninInfoBarDelegate(InfoBarService* infobar_service);
+  virtual ~OneClickSigninInfoBarDelegate();
+
+  // Returns the colours to use with the one click signin infobar.  The colours
+  // depend on the experimental group.
+  virtual void GetAlternateColors(AlternateColors* alt_colors);
+
+ private:
+#if defined(OS_WIN)
+   // Because the experiment is only running on windows, only override this
+   // function on that platform.  Other platforms that support one-click sign in
+   // will create a regular confirm infobar with no support for colour changes.
+
+  // InfoBarDelegate:
+  virtual InfoBar* CreateInfoBar(InfoBarService* owner) OVERRIDE;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(OneClickSigninInfoBarDelegate);
+};
+
+#endif  // CHROME_BROWSER_API_INFOBARS_ONE_CLICK_SIGNIN_INFOBAR_DELEGATE_H_