added CTRL+Click and SHIFT+Click handler for context menu, Back and Forward.

chrome/browser/ui/cocoa/event_utils.mm

 // Copyright (c) 2009 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.
 
 #import "chrome/browser/ui/cocoa/event_utils.h"
 
 #include "content/browser/disposition_utils.h"
+#include "ui/base/events.h"
+
+namespace {
+  bool isLeftButtonEvent(NSEvent* event) {
+    NSEventType type = [event type];
+    return type == NSLeftMouseDown ||
+      type == NSLeftMouseDragged ||
+      type == NSLeftMouseUp;
+  }
+
+  bool isRightButtonEvent(NSEvent* event) {
+    NSEventType type = [event type];
+    return type == NSRightMouseDown ||
+      type == NSRightMouseDragged ||
+      type == NSRightMouseUp;
+  }
+
+  bool isMiddleButtonEvent(NSEvent* event) {
+    if ([event buttonNumber] != 2)
+      return false;
+
+    NSEventType type = [event type];
+    return type == NSOtherMouseDown ||
+      type == NSOtherMouseDragged ||
+      type == NSOtherMouseUp;
+  }
+}
 
 namespace event_utils {
 
+// Retrieves a bitsum of ui::EventFlags from NSEvent.
+int EventFlagsFromNSEvent(NSEvent* event) {
+  NSUInteger modifiers = [event modifierFlags];
+
+  int flags = 0;
+  flags |= (modifiers & NSAlphaShiftKeyMask) ? ui::EF_CAPS_LOCK_DOWN : 0;
+  flags |= (modifiers & NSShiftKeyMask) ? ui::EF_SHIFT_DOWN : 0;
+  flags |= (modifiers & NSControlKeyMask) ? ui::EF_CONTROL_DOWN : 0;
+  flags |= (modifiers & NSAlternateKeyMask) ? ui::EF_ALT_DOWN : 0;
+  flags |= (modifiers & NSCommandKeyMask) ? ui::EF_COMMAND_DOWN : 0;
+  flags |= isLeftButtonEvent(event) ? ui::EF_LEFT_BUTTON_DOWN : 0;
+  flags |= isRightButtonEvent(event) ? ui::EF_RIGHT_BUTTON_DOWN : 0;
+  flags |= isMiddleButtonEvent(event) ? ui::EF_MIDDLE_BUTTON_DOWN : 0;
+  return flags;
+}
+
+
 WindowOpenDisposition WindowOpenDispositionFromNSEvent(NSEvent* event) {
   NSUInteger modifiers = [event modifierFlags];
   return WindowOpenDispositionFromNSEventWithFlags(event, modifiers);
 }
 
 WindowOpenDisposition WindowOpenDispositionFromNSEventWithFlags(
     NSEvent* event, NSUInteger flags) {
   return disposition_utils::DispositionFromClick(
       [event buttonNumber] == 2,
       flags & NSAlternateKeyMask,
       flags & NSControlKeyMask,
       flags & NSCommandKeyMask,
       flags & NSShiftKeyMask);
 }
 
 }  // namespace event_utils