Support detaching/attaching panels via inter-strip drags.

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 c918b8a0d9c510fdc0e6ec7146f1df72df4e3fa5..1cd92496053859f3c506fca3ccbb3de08b83047e 100644
--- a/chrome/browser/ui/panels/panel_manager.cc
+++ b/chrome/browser/ui/panels/panel_manager.cc
@@ -68,7 +68,7 @@ PanelManager::PanelManager()
   detached_strip_.reset(new DetachedPanelStrip(this));
   docked_strip_.reset(new DockedPanelStrip(this));
   overflow_strip_.reset(new OverflowPanelStrip(this));
-  drag_controller_.reset(new PanelDragController());
+  drag_controller_.reset(new PanelDragController(this));
   auto_hiding_desktop_bar_ = AutoHidingDesktopBar::Create(this);
   OnDisplayChanged();
 }
@@ -158,12 +158,13 @@ void PanelManager::OnPanelClosed(Panel* panel) {
       content::NotificationService::NoDetails());
 }
 
-void PanelManager::StartDragging(Panel* panel) {
-  drag_controller_->StartDragging(panel);
+void PanelManager::StartDragging(Panel* panel,
+                                 const gfx::Point& mouse_location) {
+  drag_controller_->StartDragging(panel, mouse_location);
 }
 
-void PanelManager::Drag(int delta_x, int delta_y) {
-  drag_controller_->Drag(delta_x, delta_y);
+void PanelManager::Drag(const gfx::Point& mouse_location) {
+  drag_controller_->Drag(mouse_location);
 }
 
 void PanelManager::EndDragging(bool cancelled) {