Add in gesture for immersive mode

ash/wm/gestures/edge_gesture_handler.h

 // Copyright (c) 2013 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_GESTURES_EDGE_GESTURE_HANDLER_H_
 #define ASH_WM_GESTURES_EDGE_GESTURE_HANDLER_H_
 
 #include "ash/shelf/shelf_types.h"
 #include "ash/wm/gestures/shelf_gesture_handler.h"
 #include "base/basictypes.h"
@@ skipping 29 matching lines @@
 
   // Returns true of the gesture has been handled and it should not be processed
   // any farther, false otherwise.
   bool ProcessGestureEvent(aura::Window* target, const ui::GestureEvent& event);
 
  private:
   // Handle events meant for showing the launcher. Returns true when no further
   // events from this gesture should be sent.
   bool HandleLauncherControl(const ui::GestureEvent& event);
 
+  // Handle events meant for engaging immerisive mode. Returns true when no
+  // further events from this gesture should be sent.
+  bool HandleImmersiveControl(aura::Window* target,
+                              const ui::GestureEvent& event);
+
   // Handle a gesture begin event.
   bool HandleEdgeGestureStart(aura::Window* target,
                               const ui::GestureEvent& event);
 
   // Determine the gesture orientation (if not yet done).
   // Returns true when the orientation has been successfully determined.
   bool DetermineGestureOrientation(const ui::GestureEvent& event);
 
   // Handles a gesture update once the orientation has been found.
   bool HandleEdgeGestureUpdate(aura::Window* target,
                                const ui::GestureEvent& event);
 
   // End a edge gesture.
   bool HandleEdgeGestureEnd(aura::Window* target,
                             const ui::GestureEvent& event);
 
   // Check that gesture starts near enough to the edge of the screen to be
   // handled here. If so, set |start_location_| and return true, otherwise
   // return false.
   bool GestureStartInEdgeArea(const gfx::Rect& screen,
                               const ui::GestureEvent& event);
 
   // Test if the gesture orientation makes sense to be dragging in or out the
   // launcher.
   bool IsGestureInLauncherOrientation(const ui::GestureEvent& event);
 
+  // Test if the gesture orientation makes sense to be engaging immersive mode.
+  bool IsGestureInImmersiveOrientation(const ui::GestureEvent& event);
+
   // Which edges the gesture is close to.
   unsigned int start_location_;
 
   // Orientation relative to the screen that the gesture is moving in
   EdgeScrollOrientation orientation_;
   ShelfGestureHandler shelf_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(EdgeGestureHandler);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_GESTURES_EDGE_GESTURE_HANDLER_H_