Add sidebar views implementation using ExtensionSystem SidebarManager

chrome/browser/ui/views/frame/browser_view.h

Index: chrome/browser/ui/views/frame/browser_view.h
diff --git a/chrome/browser/ui/views/frame/browser_view.h b/chrome/browser/ui/views/frame/browser_view.h
index 5d2032b860b2efca8a6bcdcf8474bd614f0ab474..b0d1057028afc13ad3bc6b4f0dffeb5060340eb7 100644
--- a/chrome/browser/ui/views/frame/browser_view.h
+++ b/chrome/browser/ui/views/frame/browser_view.h
@@ -30,6 +30,7 @@
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/controls/button/button.h"
+#include "ui/views/controls/single_split_view_listener.h"
 #include "ui/views/controls/webview/unhandled_keyboard_event_handler.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/widget/widget_observer.h"
@@ -68,6 +69,7 @@ class Extension;
 namespace views {
 class AccessiblePaneView;
 class ExternalFocusTracker;
+class SingleSplitView;
 class WebView;
 }
 
@@ -86,6 +88,7 @@ class BrowserView : public BrowserWindow,
                     public InfoBarContainerDelegate,
                     public LoadCompleteListener::Delegate,
                     public OmniboxPopupModelObserver,
+                    public views::SingleSplitViewListener,
                     public ExclusiveAccessContext,
                     public ExclusiveAccessBubbleViewsContext {
  public:
@@ -100,7 +103,7 @@ class BrowserView : public BrowserWindow,
 
   void set_frame(BrowserFrame* frame) { frame_ = frame; }
   BrowserFrame* frame() const { return frame_; }
-
+  int GetSidebarWidth() const;
   // Returns a pointer to the BrowserView* interface implementation (an
   // instance of this object, typically) for a given native window, or null if
   // there is no such association.
@@ -456,6 +459,10 @@ class BrowserView : public BrowserWindow,
   views::WebView* GetContentsWebViewForTest() { return contents_web_view_; }
   views::WebView* GetDevToolsWebViewForTest() { return devtools_web_view_; }
 
+  // Handle Sidebar
+  void ShowSidebar(content::WebContents* sidebar_contents);
+  void HideSidebar();
+
  private:
   // Do not friend BrowserViewLayout. Use the BrowserViewLayoutDelegate
   // interface to keep these two classes decoupled and testable.
@@ -520,7 +527,7 @@ class BrowserView : public BrowserWindow,
   // |contents|. |contents| can be null. In this case, all optional UI will be
   // removed.
   void UpdateUIForContents(content::WebContents* contents);
-
+  bool SplitHandleMoved(views::SingleSplitView* sender) override;
   // Invoked to update the necessary things when our fullscreen state changes
   // to |fullscreen|. On Windows this is invoked immediately when we toggle the
   // full screen state. On Linux changing the fullscreen state is async, so we
@@ -549,6 +556,7 @@ class BrowserView : public BrowserWindow,
 
   // Initialize the hung plugin detector.
   void InitHangMonitor();
+  void UpdateSidebarForContents(content::WebContents* sidebar_contents);
 
   // Possibly records a user metrics action corresponding to the passed-in
   // accelerator.  Only implemented for Chrome OS, where we're interested in
@@ -691,6 +699,12 @@ class BrowserView : public BrowserWindow,
 
   views::UnhandledKeyboardEventHandler unhandled_keyboard_event_handler_;
 
+  views::WebView* sidebar_web_view_;
+
+  views::View* sidebar_container_;
+
+  views::SingleSplitView* sidebar_split_;
+
   // Used to measure the loading spinner animation rate.
   base::TimeTicks last_animation_time_;