Removes aura dependencies from WindowPositioner

ash/wm/common/window_positioning_utils.h

Index: ash/wm/common/window_positioning_utils.h
diff --git a/ash/wm/common/window_positioning_utils.h b/ash/wm/common/window_positioning_utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..8145082f7890b79376a36c4ae49abb42ceab3a2b
--- /dev/null
+++ b/ash/wm/common/window_positioning_utils.h
@@ -0,0 +1,44 @@
+// Copyright 2016 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 ASH_WM_COMMON_WINDOW_POSITIONING_UTILS_H_
+#define ASH_WM_COMMON_WINDOW_POSITIONING_UTILS_H_
+
+#include "ash/ash_export.h"
+
+namespace gfx {
+class Rect;
+class Size;
+}
+
+namespace ash {
+namespace wm {
+
+// We force at least this many DIPs for any window on the screen.
+const int kMinimumOnScreenArea = 25;
+
+// Adjusts |bounds| so that the size does not exceed |max_size|.
+ASH_EXPORT void AdjustBoundsSmallerThan(const gfx::Size& max_size,
+                                        gfx::Rect* bounds);
+
+// Move the given bounds inside the given |visible_area| in parent coordinates,
+// including a safety margin given by |min_width| and |min_height|.
+// This also ensures that the top of the bounds is visible.
+ASH_EXPORT void AdjustBoundsToEnsureWindowVisibility(
+    const gfx::Rect& visible_area,
+    int min_width,
+    int min_height,
+    gfx::Rect* bounds);
+
+// Move the given bounds inside the given |visible_area| in parent coordinates,
+// including a safety margin given by |kMinimumOnScreenArea|.
+// This also ensures that the top of the bounds is visible.
+ASH_EXPORT void AdjustBoundsToEnsureMinimumWindowVisibility(
+    const gfx::Rect& visible_area,
+    gfx::Rect* bounds);
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_COMMON_WINDOW_POSITIONING_UTILS_H_