Refactor intra-strip panel drags by introducing PanelDragController.

chrome/browser/ui/panels/panel_manager.cc

Index: chrome/browser/ui/panels/panel_manager.cc
diff --git a/chrome/browser/ui/panels/panel_manager.cc b/chrome/browser/ui/panels/panel_manager.cc
index 4b4848bebb78fea8ab0fc7cf86789c936013dd6f..2108e0be7acab764f7f5857dd7e32c30b7a93125 100644
--- a/chrome/browser/ui/panels/panel_manager.cc
+++ b/chrome/browser/ui/panels/panel_manager.cc
@@ -10,8 +10,10 @@
 #include "chrome/browser/fullscreen.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/panels/detached_panel_strip.h"
 #include "chrome/browser/ui/panels/docked_panel_strip.h"
 #include "chrome/browser/ui/panels/overflow_panel_strip.h"
+#include "chrome/browser/ui/panels/panel_drag_controller.h"
 #include "chrome/browser/ui/panels/panel_mouse_watcher.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
@@ -63,8 +65,10 @@ PanelManager::PanelManager()
     : panel_mouse_watcher_(PanelMouseWatcher::Create()),
       auto_sizing_enabled_(true),
       is_full_screen_(false) {
+  detached_strip_.reset(new DetachedPanelStrip(this));
   docked_strip_.reset(new DockedPanelStrip(this));
   overflow_strip_.reset(new OverflowPanelStrip(this));
+  drag_controller_.reset(new PanelDragController());
   auto_hiding_desktop_bar_ = AutoHidingDesktopBar::Create(this);
   OnDisplayChanged();
 }
@@ -159,16 +163,20 @@ void PanelManager::OnPanelRemoved(Panel* panel) {
       content::NotificationService::NoDetails());
 }
 
+bool PanelManager::CanDrag(Panel* panel) const {
+  return drag_controller_->CanDrag(panel);
+}
+
 void PanelManager::StartDragging(Panel* panel) {
-  docked_strip_->StartDragging(panel);
+  drag_controller_->StartDragging(panel);
 }
 
-void PanelManager::Drag(int delta_x) {
-  docked_strip_->Drag(delta_x);
+void PanelManager::Drag(int delta_x, int delta_y) {
+  drag_controller_->Drag(delta_x, delta_y);
 }
 
 void PanelManager::EndDragging(bool cancelled) {
-  docked_strip_->EndDragging(cancelled);
+  drag_controller_->EndDragging(cancelled);
 }
 
 void PanelManager::OnPanelExpansionStateChanged(Panel* panel) {
@@ -244,6 +252,7 @@ void PanelManager::OnAutoHidingDesktopBarVisibilityChanged(
 }
 
 void PanelManager::CloseAll() {
+  detached_strip_->CloseAll();
   docked_strip_->CloseAll();
   overflow_strip_->CloseAll();
 }