aura: Remove client::UserActionClient.

chrome/browser/ui/views/frame/browser_command_handler_x11.cc

+// Copyright 2014 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/views/frame/browser_command_handler_x11.h"
+
+#include <X11/Xlib.h>
+
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/web_contents.h"
+#include "ui/events/event.h"
+#include "ui/events/event_utils.h"
+
+BrowserCommandHandlerX11::BrowserCommandHandlerX11(Browser* browser)
+    : browser_(browser) {}
+
+BrowserCommandHandlerX11::~BrowserCommandHandlerX11() {}
+
+void BrowserCommandHandlerX11::OnMouseEvent(ui::MouseEvent* event) {
+  if (event->type() != ui::ET_MOUSE_PRESSED)
+    return;
+  XEvent* xevent = event->native_event();
+  if (!xevent)
+    return;
+  int button = xevent->type == GenericEvent ? ui::EventButtonFromNative(xevent)
+                                            : xevent->xbutton.button;
+
+  // Standard Linux mouse buttons for going back and forward.
+  const int kBackMouseButton = 8;
+  const int kForwardMouseButton = 9;
+  if (button == kBackMouseButton || button == kForwardMouseButton) {
+    content::WebContents* contents =
+        browser_->tab_strip_model()->GetActiveWebContents();
+    if (!contents)
+      return;
+    content::NavigationController& controller = contents->GetController();
+    if (button == kBackMouseButton && controller.CanGoBack())
+      controller.GoBack();
+    else if (button == kForwardMouseButton && controller.CanGoForward())
+      controller.GoForward();
+    // Always consume the event, whether a navigation was successful or not.
+    event->SetHandled();
+  }
+}