Enables docked windows by default

ash/wm/workspace/workspace_window_resizer.h

Index: ash/wm/workspace/workspace_window_resizer.h
diff --git a/ash/wm/workspace/workspace_window_resizer.h b/ash/wm/workspace/workspace_window_resizer.h
index 5acaf8e5b0ddab5b57c252fb5e762a5c97f72079..1344f57c6751d3f5b26555319d479e6712dec317 100644
--- a/ash/wm/workspace/workspace_window_resizer.h
+++ b/ash/wm/workspace/workspace_window_resizer.h
@@ -74,9 +74,7 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
                          const std::vector<aura::Window*>& attached_windows);
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, CancelSnapPhantom);
-  FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, PhantomSnapMaxSize);
-  FRIEND_TEST_ALL_PREFIXES(WorkspaceWindowResizerTest, PhantomWindowShow);
+  friend class WorkspaceWindowResizerTest;
 
   // Returns the final bounds to place the window at. This differs from
   // the current when snapping.
@@ -221,6 +219,9 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   // gets dragged into another browser window.
   base::WeakPtrFactory<WorkspaceWindowResizer> weak_ptr_factory_;
 
+  // Current instance for use by the WorkspaceWindowResizerTest.
+  static WorkspaceWindowResizer* instance_;
+
   DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowResizer);
 };