diff --git chrome/browser/ui/browser.cc chrome/browser/ui/browser.cc
index 71ec3bbbf1b6..8b99a3ac7de2 100644
--- chrome/browser/ui/browser.cc
+++ chrome/browser/ui/browser.cc
@@ -257,6 +257,20 @@
 #include "components/captive_portal/content/captive_portal_tab_helper.h"
 #endif
 
+#if BUILDFLAG(ENABLE_CEF)
+#define CALL_CEF_DELEGATE(name, ...) \
+  if (cef_browser_delegate_) { \
+    cef_browser_delegate_->name(__VA_ARGS__); \
+  }
+#define CALL_CEF_DELEGATE_RETURN(name, ...) \
+  if (cef_browser_delegate_) { \
+    return cef_browser_delegate_->name(__VA_ARGS__); \
+  }
+#else  // !BUILDFLAG(ENABLE_CEF)
+#define CALL_CEF_DELEGATE(name, ...)
+#define CALL_CEF_DELEGATE_RETURN(name, ...)
+#endif
+
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/extension_browser_window_helper.h"
 #endif
@@ -470,6 +484,13 @@ Browser::Browser(const CreateParams& params)
 
   CHECK(CanCreateBrowserForProfile(profile_));
 
+#if BUILDFLAG(ENABLE_CEF)
+  if (cef::IsChromeRuntimeEnabled()) {
+    cef_browser_delegate_ =
+        cef::BrowserDelegate::Create(this, params.cef_params);
+  }
+#endif
+
   tab_strip_model_->AddObserver(this);
 
   location_bar_model_ = std::make_unique<LocationBarModelImpl>(
@@ -1713,6 +1734,8 @@ void Browser::LoadingStateChanged(WebContents* source,
                                   bool to_different_document) {
   ScheduleUIUpdate(source, content::INVALIDATE_TYPE_LOAD);
   UpdateWindowForLoadingStateChanged(source, to_different_document);
+
+  CALL_CEF_DELEGATE(LoadingStateChanged, source, to_different_document);
 }
 
 void Browser::CloseContents(WebContents* source) {
@@ -1740,6 +1763,8 @@ void Browser::SetContentsBounds(WebContents* source, const gfx::Rect& bounds) {
 }
 
 void Browser::UpdateTargetURL(WebContents* source, const GURL& url) {
+  CALL_CEF_DELEGATE(UpdateTargetURL, source, url);
+
   if (!GetStatusBubble())
     return;
 
@@ -1747,6 +1772,17 @@ void Browser::UpdateTargetURL(WebContents* source, const GURL& url) {
     GetStatusBubble()->SetURL(url);
 }
 
+bool Browser::DidAddMessageToConsole(
+    content::WebContents* source,
+    blink::mojom::ConsoleMessageLevel log_level,
+    const base::string16& message,
+    int32_t line_no,
+    const base::string16& source_id) {
+  CALL_CEF_DELEGATE_RETURN(DidAddMessageToConsole, source, log_level, message,
+                           line_no, source_id);
+  return false;
+}
+
 void Browser::ContentsMouseEvent(WebContents* source,
                                  bool motion,
                                  bool exited) {
@@ -1899,6 +1935,8 @@ void Browser::RendererResponsive(
 void Browser::DidNavigateMainFramePostCommit(WebContents* web_contents) {
   if (web_contents == tab_strip_model_->GetActiveWebContents())
     UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
+
+  CALL_CEF_DELEGATE(DidNavigateMainFramePostCommit, web_contents);
 }
 
 content::JavaScriptDialogManager* Browser::GetJavaScriptDialogManager(
@@ -1949,11 +1987,15 @@ void Browser::EnterFullscreenModeForTab(
     const blink::mojom::FullscreenOptions& options) {
   exclusive_access_manager_->fullscreen_controller()->EnterFullscreenModeForTab(
       requesting_frame, options.display_id);
+
+  CALL_CEF_DELEGATE(EnterFullscreenModeForTab, requesting_frame, options);
 }
 
 void Browser::ExitFullscreenModeForTab(WebContents* web_contents) {
   exclusive_access_manager_->fullscreen_controller()->ExitFullscreenModeForTab(
       web_contents);
+
+  CALL_CEF_DELEGATE(ExitFullscreenModeForTab, web_contents);
 }
 
 bool Browser::IsFullscreenForTabOrPending(const WebContents* web_contents) {
@@ -2814,6 +2856,8 @@ void Browser::SetAsDelegate(WebContents* web_contents, bool set_delegate) {
     content_translate_driver->RemoveObserver(this);
     BookmarkTabHelper::FromWebContents(web_contents)->RemoveObserver(this);
   }
+
+  CALL_CEF_DELEGATE(SetAsDelegate, web_contents, set_delegate);
 }
 
 void Browser::CloseFrame() {
diff --git chrome/browser/ui/browser.h chrome/browser/ui/browser.h
index ab2a03e6e878..aef94abf4fd8 100644
--- chrome/browser/ui/browser.h
+++ chrome/browser/ui/browser.h
@@ -21,6 +21,7 @@
 #include "base/strings/string16.h"
 #include "base/timer/elapsed_timer.h"
 #include "build/build_config.h"
+#include "cef/libcef/features/runtime.h"
 #include "chrome/browser/devtools/devtools_toggle_action.h"
 #include "chrome/browser/ui/bookmarks/bookmark_bar.h"
 #include "chrome/browser/ui/bookmarks/bookmark_tab_helper_observer.h"
@@ -56,6 +57,10 @@
 #include "ui/gfx/geometry/rect.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
+#if BUILDFLAG(ENABLE_CEF)
+#include "cef/libcef/browser/chrome/browser_delegate.h"
+#endif
+
 #if defined(OS_ANDROID)
 #error This file should only be included on desktop.
 #endif
@@ -241,6 +246,11 @@ class Browser : public TabStripModelObserver,
     // default. Intended for testing.
     BrowserWindow* window = nullptr;
 
+#if BUILDFLAG(ENABLE_CEF)
+    // Opaque CEF-specific configuration. Will be propagated to new Browsers.
+    scoped_refptr<cef::BrowserDelegate::CreateParams> cef_params;
+#endif
+
    private:
     friend class Browser;
     friend class WindowSizerChromeOSTest;
@@ -358,6 +368,12 @@ class Browser : public TabStripModelObserver,
     return &signin_view_controller_;
   }
 
+#if BUILDFLAG(ENABLE_CEF)
+  cef::BrowserDelegate* cef_delegate() const {
+    return cef_browser_delegate_.get();
+  }
+#endif
+
   // Get the FindBarController for this browser, creating it if it does not
   // yet exist.
   FindBarController* GetFindBarController();
@@ -742,6 +758,11 @@ class Browser : public TabStripModelObserver,
   void SetContentsBounds(content::WebContents* source,
                          const gfx::Rect& bounds) override;
   void UpdateTargetURL(content::WebContents* source, const GURL& url) override;
+  bool DidAddMessageToConsole(content::WebContents* source,
+                              blink::mojom::ConsoleMessageLevel log_level,
+                              const base::string16& message,
+                              int32_t line_no,
+                              const base::string16& source_id) override;
   void ContentsMouseEvent(content::WebContents* source,
                           bool motion,
                           bool exited) override;
@@ -1206,6 +1227,10 @@ class Browser : public TabStripModelObserver,
       extension_browser_window_helper_;
 #endif
 
+#if BUILDFLAG(ENABLE_CEF)
+  std::unique_ptr<cef::BrowserDelegate> cef_browser_delegate_;
+#endif
+
   const base::ElapsedTimer creation_timer_;
 
   // Stores the list of browser windows showing via a menu.