Adjusts dragging logic to be less likely to trigger false positive switch from snapping to docking

ash/wm/workspace/two_step_edge_cycler.h

Index: ash/wm/workspace/two_step_edge_cycler.h
diff --git a/ash/wm/workspace/two_step_edge_cycler.h b/ash/wm/workspace/two_step_edge_cycler.h
index 01ca0866220f7808eacd3e769c99bed948e842f9..3254cfd930ddb25851430636c2448f0c1f5190bd 100644
--- a/ash/wm/workspace/two_step_edge_cycler.h
+++ b/ash/wm/workspace/two_step_edge_cycler.h
@@ -19,7 +19,10 @@ namespace ash {
 // the workspace.
 class ASH_EXPORT TwoStepEdgeCycler {
  public:
-  explicit TwoStepEdgeCycler(const gfx::Point& start);
+  // The direction in which a mouse should travel to switch mode.
+  enum Direction { DIRECTION_LEFT, DIRECTION_RIGHT };
+
+  explicit TwoStepEdgeCycler(const gfx::Point& start, Direction direction);
   ~TwoStepEdgeCycler();
 
   // Update which mode should be used as a result of a mouse / touch move.
@@ -41,6 +44,15 @@ class ASH_EXPORT TwoStepEdgeCycler {
   // Initial x-coordinate.
   int start_x_;
 
+  // x-coordinate when paused.
+  int paused_x_;
+
+  // Whether the movement was paused.
+  bool paused_;
+
+  // Determines a preferred movement direction that we are watching.
+  Direction direction_;
+
   DISALLOW_COPY_AND_ASSIGN(TwoStepEdgeCycler);
 };