Only support left/right maximizing at 50% width when the --ash-enable-alternate-caption-button

ash/wm/window_util.h

Index: ash/wm/window_util.h
diff --git a/ash/wm/window_util.h b/ash/wm/window_util.h
index 6822a77f32ebb8b62ee9c552894edfbca6d06c0d..d463ca001dcdef3e752342f1fb23eb27d38f270a 100644
--- a/ash/wm/window_util.h
+++ b/ash/wm/window_util.h
@@ -8,16 +8,13 @@
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "ui/base/ui_base_types.h"
+#include "ui/gfx/rect.h"
 
 namespace aura {
 class RootWindow;
 class Window;
 }
 
-namespace gfx {
-class Rect;
-}
-
 namespace ui {
 class Event;
 class Layer;
@@ -29,6 +26,12 @@ const int kMinimumOnScreenArea = 10;
 
 namespace wm {
 
+// The edge to snap a window to.
+enum SnapEdge {
+SNAP_LEFT_EDGE,
+SNAP_RIGHT_EDGE
+};
+
 // Convenience setters/getters for |aura::client::kRootWindowActiveWindow|.
 ASH_EXPORT void ActivateWindow(aura::Window* window);
 ASH_EXPORT void DeactivateWindow(aura::Window* window);
@@ -82,6 +85,13 @@ ASH_EXPORT void RestoreWindow(aura::Window* window);
 // Maximizes or restores |window| based on its state. |window| must not be NULL.
 ASH_EXPORT void ToggleMaximizedWindow(aura::Window* window);
 
+// Returns the bounds for snapped windows at |edge| in parent coordinates.
+ASH_EXPORT gfx::Rect GetSnappedWindowBoundsInParent(aura::Window* window,
+                                                    SnapEdge edge);
+
+// Snaps |window| to the left or the right edge.
+ASH_EXPORT void SnapWindowToEdge(aura::Window*, SnapEdge edge);
+
 // Moves the window to the center of the display.
 ASH_EXPORT void CenterWindow(aura::Window* window);