Implementation for switching between recently used tabs using ctrl tilde or quoteleft.

chrome/browser/ui/gtk/browser_window_gtk.cc

Index: chrome/browser/ui/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/browser_window_gtk.cc b/chrome/browser/ui/gtk/browser_window_gtk.cc
index 8037ff8b57b6dca5f4fd0756c75e537ce76cf886..d3b64ac26f150e992947a926168296e822239b47 100644
--- a/chrome/browser/ui/gtk/browser_window_gtk.cc
+++ b/chrome/browser/ui/gtk/browser_window_gtk.cc
@@ -78,6 +78,7 @@
 #include "chrome/browser/ui/omnibox/omnibox_view.h"
 #include "chrome/browser/ui/page_info_bubble.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
+#include "chrome/browser/ui/tabs/mru_tab_controller.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_notification_types.h"
@@ -1793,6 +1794,8 @@ void BrowserWindowGtk::ConnectHandlersToSignals() {
                    G_CALLBACK(OnWindowStateThunk), this);
   g_signal_connect(window_, "key-press-event",
                    G_CALLBACK(OnKeyPressThunk), this);
+  g_signal_connect(window_, "key-release-event",
+                   G_CALLBACK(OnKeyReleaseThunk), this);
   g_signal_connect(window_, "motion-notify-event",
                    G_CALLBACK(OnMouseMoveEventThunk), this);
   g_signal_connect(window_, "button-press-event",
@@ -2213,6 +2216,22 @@ gboolean BrowserWindowGtk::OnKeyPress(GtkWidget* widget, GdkEventKey* event) {
   if (extension_keybinding_registry_->HasPriorityHandler(event))
     return FALSE;
 
+  // Pause tab mru stack updates when control key is pressed. For eg. ignore
+  // active tab changes when ctrl key is pressed. Commit the changes only
+  // on releasing the ctrl key.
+  MRUTabController* mru_tab_controller = browser()->mru_tab_controller();
+  if (mru_tab_controller) {
+    guint modifier = event->state & gtk_accelerator_get_default_mod_mask();
+    if (GDK_CONTROL_MASK == modifier) {
+      if ((event->keyval == GDK_KEY_asciitilde) ||
+          (event->keyval == GDK_KEY_quoteleft)) {
+        mru_tab_controller->CommitActiveTabChanges();
+      } else {
+        mru_tab_controller->PauseStackUpdates();
+      }
+    }
+  }
+
   // If a widget besides the native view is focused, we have to try to handle
   // the custom accelerators before letting it handle them.
   WebContents* current_web_contents = chrome::GetActiveWebContents(browser());
@@ -2242,6 +2261,17 @@ gboolean BrowserWindowGtk::OnKeyPress(GtkWidget* widget, GdkEventKey* event) {
   return TRUE;
 }
 
+gboolean BrowserWindowGtk::OnKeyRelease(GtkWidget* widget, GdkEventKey* event) {
+  MRUTabController* mru_tab_controller = browser()->mru_tab_controller();
+  if (mru_tab_controller &&
+      (event->keyval == GDK_KEY_Control_L ||
+       event->keyval == GDK_KEY_Control_R)) {
+    mru_tab_controller->CommitActiveTabChanges();
+  }
+
+  return FALSE;
+}
+
 gboolean BrowserWindowGtk::OnMouseMoveEvent(GtkWidget* widget,
                                             GdkEventMotion* event) {
   // This method is used to update the mouse cursor when over the edge of the