Merge revision 598 changes:

- Mac: Add flagsChanged: signal handler so that modifier keys are correctly passed to JS (issue #574).

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1025@599 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser_webview_mac.mm

@@ -149,6 +149,11 @@
     browser_->UIT_GetWebViewHost()->KeyEvent(theEvent);
 }
 
+- (void)flagsChanged:(NSEvent *)theEvent {
+  if (browser_ && browser_->UIT_GetWebView())
+    browser_->UIT_GetWebViewHost()->KeyEvent(theEvent);
+}
+
 - (BOOL)isOpaque {
   return YES;
 }