chrome: Support usage of the Chrome toolbar from Views (see issue #2969)

include/views/cef_browser_view.h

@@ -80,6 +80,17 @@ class CefBrowserView : public CefView {
   /*--cef()--*/
   virtual CefRefPtr<CefBrowser> GetBrowser() = 0;
 
+  ///
+  // Returns the Chrome toolbar associated with this BrowserView. Only supported
+  // when using the Chrome runtime. The CefBrowserViewDelegate::
+  // GetChromeToolbarType() method must return a value other than
+  // CEF_CTT_NONE and the toolbar will not be available until after this
+  // BrowserView is added to a CefWindow and CefViewDelegate::OnWindowChanged()
+  // has been called.
+  ///
+  /*--cef()--*/
+  virtual CefRefPtr<CefView> GetChromeToolbar() = 0;
+
   ///
   // Sets whether accelerators registered with CefWindow::SetAccelerator are
   // triggered before or after the event is sent to the CefBrowser. If

include/views/cef_browser_view_delegate.h

@@ -52,6 +52,8 @@ class CefBrowserView;
 /*--cef(source=client)--*/
 class CefBrowserViewDelegate : public CefViewDelegate {
  public:
+  typedef cef_chrome_toolbar_type_t ChromeToolbarType;
+
   ///
   // Called when |browser| associated with |browser_view| is created. This
   // method will be called after CefLifeSpanHandler::OnAfterCreated() is called
@@ -104,6 +106,14 @@ class CefBrowserViewDelegate : public CefViewDelegate {
       bool is_devtools) {
     return false;
   }
+
+  ///
+  // Returns the Chrome toolbar type that will be available via
+  // CefBrowserView::GetChromeToolbar(). See that method for related
+  // documentation.
+  ///
+  /*--cef(default_retval=CEF_CTT_NONE)--*/
+  virtual ChromeToolbarType GetChromeToolbarType() { return CEF_CTT_NONE; }
 };
 
 #endif  // CEF_INCLUDE_VIEWS_CEF_BROWSER_VIEW_DELEGATE_H_

include/views/cef_view_delegate.h

@@ -105,6 +105,12 @@ class CefViewDelegate : public virtual CefBaseRefCounted {
                                   bool added,
                                   CefRefPtr<CefView> child) {}
 
+  ///
+  // Called when |view| is added or removed from the CefWindow.
+  ///
+  /*--cef(optional_param=window)--*/
+  virtual void OnWindowChanged(CefRefPtr<CefView> view, bool added) {}
+
   ///
   // Called when |view| gains focus.
   ///