CrOS Tablet Window management - Split Screen part I

ash/wm/overview/window_grid.h

Index: ash/wm/overview/window_grid.h
diff --git a/ash/wm/overview/window_grid.h b/ash/wm/overview/window_grid.h
index a0352d94aa4eb33af44d92b458b102127f1b3dfa..7164cfda094f37fe94a79b3387567f210ef0871e 100644
--- a/ash/wm/overview/window_grid.h
+++ b/ash/wm/overview/window_grid.h
@@ -16,6 +16,7 @@
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "ui/aura/window_observer.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace views {
 class Widget;
@@ -52,7 +53,8 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver,
  public:
   WindowGrid(aura::Window* root_window,
              const std::vector<aura::Window*>& window_list,
-             WindowSelector* window_selector);
+             WindowSelector* window_selector,
+             const gfx::Rect& bounds_in_screen);
   ~WindowGrid() override;
 
   // Exits overview mode, fading out the |shield_widget_| if necessary.
@@ -88,6 +90,9 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver,
   // this grid owns.
   bool Contains(const aura::Window* window) const;
 
+  // Removes |selector_item| from the grid.
+  void RemoveItem(WindowSelectorItem* selector_item);
+
   // Dims the items whose titles do not contain |pattern| and prevents their
   // selection. The pattern has its accents removed and is converted to
   // lowercase in a l10n sensitive context.
@@ -99,6 +104,9 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver,
   // opacity, effectively hiding the selector widget.
   void WindowClosing(WindowSelectorItem* window);
 
+  // Sets bounds for the window grid and positions all windows in the grid.
+  void SetBoundsAndUpdatePositions(const gfx::Rect& bounds_in_screen);
+
   // Returns true if the grid has no more windows.
   bool empty() const { return window_list_.empty(); }
 
@@ -190,6 +198,9 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver,
   // True only after all windows have been prepared for overview.
   bool prepared_for_overview_;
 
+  // This WindowGrid's total bounds in screen coordinates.
+  gfx::Rect bounds_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowGrid);
 };