Initial import.

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diff --git a/chromium/ui/base/layout.h b/chromium/ui/base/layout.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 UI_BASE_LAYOUT_H_
+#define UI_BASE_LAYOUT_H_
+
+#include <vector>
+
+#include "build/build_config.h"
+#include "ui/base/ui_export.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace ui {
+
+enum DisplayLayout {
+  // The typical layout for e.g. Windows, Mac and Linux.
+  LAYOUT_DESKTOP,
+
+  // Layout optimized for touch.  Used e.g. for Windows 8 Metro mode.
+  LAYOUT_TOUCH,
+};
+
+// Returns the display layout that should be used.  This could be used
+// e.g. to tweak hard-coded padding that's layout specific, or choose
+// the .pak file of theme resources to load.
+// WARNING: this is deprecated and will be nuked as soon as aura is the default
+// on windows.
+UI_EXPORT DisplayLayout GetDisplayLayout();
+
+// Supported UI scale factors for the platform. This is used as an index
+// into the array |kScaleFactorScales| which maps the enum value to a float.
+// SCALE_FACTOR_NONE is used for density independent resources such as
+// string, html/js files or an image that can be used for any scale factors
+// (such as wallpapers).
+enum ScaleFactor {
+  SCALE_FACTOR_NONE = 0,
+  SCALE_FACTOR_100P,
+  SCALE_FACTOR_133P,
+  SCALE_FACTOR_140P,
+  SCALE_FACTOR_150P,
+  SCALE_FACTOR_180P,
+  SCALE_FACTOR_200P,
+
+  NUM_SCALE_FACTORS  // This always appears last.
+};
+
+// Returns the float scale value for |scale_factor|.
+UI_EXPORT float GetScaleFactorScale(ScaleFactor scale_factor);
+
+// Returns the supported ScaleFactor which most closely matches |scale|.
+// Converting from float to ScaleFactor is inefficient and should be done as
+// little as possible.
+// TODO(oshima): Make ScaleFactor a class and remove this.
+UI_EXPORT ScaleFactor GetScaleFactorFromScale(float scale);
+
+// Returns the ScaleFactor used by |view|.
+UI_EXPORT ScaleFactor GetScaleFactorForNativeView(gfx::NativeView view);
+
+// Returns the maximum device scale factor supported by this platform.
+UI_EXPORT ScaleFactor GetMaxScaleFactor();
+
+// Returns a vector with the scale factors which are supported by this
+// platform, in ascending order.
+UI_EXPORT std::vector<ScaleFactor> GetSupportedScaleFactors();
+
+// Returns true if |scale_factor| is supported by this platform.
+UI_EXPORT bool IsScaleFactorSupported(ScaleFactor scale_factor);
+
+namespace test {
+
+// Changes the value of GetSupportedScaleFactors() to |scale_factors|.
+// Use ScopedSetSupportedScaleFactors for unit tests as not to affect the
+// state of other tests.
+UI_EXPORT void SetSupportedScaleFactors(
+    const std::vector<ScaleFactor>& scale_factors);
+
+// Class which changes the value of GetSupportedScaleFactors() to
+// |new_scale_factors| for the duration of its lifetime.
+class UI_EXPORT ScopedSetSupportedScaleFactors {
+ public:
+  explicit ScopedSetSupportedScaleFactors(
+      const std::vector<ui::ScaleFactor>& new_scale_factors);
+  ~ScopedSetSupportedScaleFactors();
+
+ private:
+  const std::vector<ui::ScaleFactor> original_scale_factors_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedSetSupportedScaleFactors);
+};
+
+}  // namespace test
+
+}  // namespace ui
+
+#endif  // UI_BASE_LAYOUT_H_