Refactor PhantomWindowController so that the PhantomWindowController owns the phantom window

ash/wm/caption_buttons/alternate_frame_size_button.cc

Index: ash/wm/caption_buttons/alternate_frame_size_button.cc
diff --git a/ash/wm/caption_buttons/alternate_frame_size_button.cc b/ash/wm/caption_buttons/alternate_frame_size_button.cc
index 24f9a0ad90be5a162b2de09cc2aa520946e83956..044e7a3a69b5c9c10cee4036c823e6cb79e520a4 100644
--- a/ash/wm/caption_buttons/alternate_frame_size_button.cc
+++ b/ash/wm/caption_buttons/alternate_frame_size_button.cc
@@ -8,6 +8,7 @@
 #include "ash/shell.h"
 #include "ash/touch/touch_uma.h"
 #include "ash/wm/window_state.h"
+#include "ash/wm/workspace/phantom_window_controller.h"
 #include "ash/wm/workspace/snap_sizer.h"
 #include "ui/gfx/vector2d.h"
 #include "ui/views/widget/widget.h"
@@ -176,6 +177,24 @@ void AlternateFrameSizeButton::UpdatePressedButton(
         break;
     }
   }
+
+  if (snap_type_ == SNAP_LEFT || snap_type_ == SNAP_RIGHT) {
+    if (!phantom_window_controller_.get()) {
+      phantom_window_controller_.reset(
+          new internal::PhantomWindowController(frame_->GetNativeWindow()));
+    }
+
+    using internal::SnapSizer;
+    SnapSizer snap_sizer(wm::GetWindowState(frame_->GetNativeWindow()),
+                         gfx::Point(),
+                         snap_type_ == SNAP_LEFT ?
+                             SnapSizer::LEFT_EDGE : SnapSizer::RIGHT_EDGE,
+                         SnapSizer::OTHER_INPUT);
+    phantom_window_controller_->Show(snap_sizer.target_bounds());
+  } else {
+    if (phantom_window_controller_.get())
+      phantom_window_controller_->StartFadeOut();
+  }
 }
 
 bool AlternateFrameSizeButton::CommitSnap(const ui::LocatedEvent& event) {
@@ -206,6 +225,7 @@ void AlternateFrameSizeButton::SetButtonsToNormalMode(
   snap_type_ = SNAP_NONE;
   set_buttons_to_snap_mode_timer_.Stop();
   delegate_->SetButtonsToNormal(animate);
+  phantom_window_controller_.reset();
 }
 
 }  // namespace ash