Enable user resizing for docked Panels (GTK and Mac).

chrome/browser/ui/panels/panel_resize_controller.cc

Index: chrome/browser/ui/panels/panel_resize_controller.cc
diff --git a/chrome/browser/ui/panels/panel_resize_controller.cc b/chrome/browser/ui/panels/panel_resize_controller.cc
index 16e56e2682956b74d6e81369cf6d1750efda270d..939d296df1a48e4921d59ad99f572d28281418c5 100644
--- a/chrome/browser/ui/panels/panel_resize_controller.cc
+++ b/chrome/browser/ui/panels/panel_resize_controller.cc
@@ -5,8 +5,6 @@
 #include "chrome/browser/ui/panels/panel_resize_controller.h"
 
 #include "base/logging.h"
-#include "chrome/browser/ui/panels/detached_panel_strip.h"
-#include "chrome/browser/ui/panels/docked_panel_strip.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/browser/ui/panels/panel_strip.h"
@@ -47,21 +45,19 @@ void PanelResizeController::StartResizing(Panel* panel,
                                           const gfx::Point& mouse_location,
                                           panel::ResizingSides sides) {
   DCHECK(!IsResizing());
-  DCHECK(panel->panel_strip() &&
-         panel->panel_strip()->CanResizePanel(panel));
-
+  DCHECK_NE(panel::NOT_RESIZABLE, panel->CanResizeByMouse());
   DCHECK_NE(panel::RESIZE_NONE, sides);
 
   mouse_location_at_start_ = mouse_location;
   bounds_at_start_ = panel->GetBounds();
   sides_resized_ = sides;
   resizing_panel_ = panel;
+  resizing_panel_->SetPreviewMode(true);
 }
 
 void PanelResizeController::Resize(const gfx::Point& mouse_location) {
   DCHECK(IsResizing());
-  if (resizing_panel_->panel_strip() == NULL ||
-      !resizing_panel_->panel_strip()->CanResizePanel(resizing_panel_)) {
+  if (resizing_panel_->CanResizeByMouse() == panel::NOT_RESIZABLE) {
     EndResizing(false);
     return;
   }
@@ -72,6 +68,7 @@ void PanelResizeController::Resize(const gfx::Point& mouse_location) {
                      mouse_location.x() - mouse_location_at_start_.x(), 0));
   }
   if (ResizingBottom(sides_resized_)) {
+    DCHECK_EQ(panel::ALL_SIDES, resizing_panel_->CanResizeByMouse());
     bounds.set_height(std::max(bounds_at_start_.height() +
                       mouse_location.y() - mouse_location_at_start_.y(), 0));
   }
@@ -111,6 +108,10 @@ void PanelResizeController::EndResizing(bool cancelled) {
                                           bounds_at_start_);
   }
 
+  resizing_panel_->SetPreviewMode(false);
+  if (resizing_panel_->panel_strip())
+    resizing_panel_->panel_strip()->RefreshLayout();
+
   // Do a thorough cleanup.
   resizing_panel_ = NULL;
   sides_resized_ = panel::RESIZE_NONE;