Refactor intra-strip panel drags by introducing PanelDragController.

chrome/browser/ui/panels/panel.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/panels/panel.h"
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 31 matching lines @@
       web_app::GetExtensionIdFromApplicationName(browser->app_name()), false);
 }
 
 Panel::Panel(Browser* browser, const gfx::Size& requested_size)
     : browser_(browser),
       panel_strip_(NULL),
       initialized_(false),
       has_temporary_layout_(false),
       restored_size_(requested_size),
       auto_resizable_(false),
-      draggable_(true),
       expansion_state_(EXPANDED),
       old_expansion_state_(EXPANDED),
       app_icon_visible_(true) {
 }
 
 Panel::~Panel() {
   // Invoked by native panel destructor. Do not access native_panel_ here.
 }
 
 void Panel::Initialize(const gfx::Rect& bounds) {
@@ skipping 614 matching lines @@
       native_panel_->ContentSizeFromWindowSize(max_size_));
 }
 
 void Panel::OnWindowSizeAvailable() {
   ConfigureAutoResize(browser()->GetSelectedWebContents());
 }
 
 void Panel::DestroyBrowser() {
   native_panel_->DestroyPanelBrowser();
 }