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

chrome/browser/ui/cocoa/event_utils.mm

Index: chrome/browser/ui/cocoa/event_utils.mm
diff --git a/chrome/browser/ui/cocoa/event_utils.mm b/chrome/browser/ui/cocoa/event_utils.mm
index 32ad8f80c649cc2995b0335adc66fd225b714a37..5b7723225c172e0cd850a56cb3314471c33cffc5 100644
--- a/chrome/browser/ui/cocoa/event_utils.mm
+++ b/chrome/browser/ui/cocoa/event_utils.mm
@@ -5,9 +5,53 @@
 #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);