Delay Input.dispatchKeyEvent response until after key event ack.

content/browser/renderer_host/native_web_keyboard_event_mac.mm

Index: content/browser/renderer_host/native_web_keyboard_event_mac.mm
diff --git a/content/browser/renderer_host/native_web_keyboard_event_mac.mm b/content/browser/renderer_host/native_web_keyboard_event_mac.mm
index beed79ae54f8d8cffb5bf62f7c262f5b27dc32b0..ee572c48689957a39c3b024c5f9b5a4ad9a5bf0a 100644
--- a/content/browser/renderer_host/native_web_keyboard_event_mac.mm
+++ b/content/browser/renderer_host/native_web_keyboard_event_mac.mm
@@ -13,13 +13,15 @@ namespace content {
 
 NativeWebKeyboardEvent::NativeWebKeyboardEvent()
     : os_event(NULL),
-      skip_in_browser(false) {
+      skip_in_browser(false),
+      is_synthetic(false) {
 }
 
 NativeWebKeyboardEvent::NativeWebKeyboardEvent(gfx::NativeEvent native_event)
     : WebKeyboardEvent(WebKeyboardEventBuilder::Build(native_event)),
       os_event([native_event retain]),
-      skip_in_browser(false) {}
+      skip_in_browser(false),
+      is_synthetic(false) {}
 
 NativeWebKeyboardEvent::NativeWebKeyboardEvent(const ui::KeyEvent& key_event)
     : NativeWebKeyboardEvent(key_event.native_event()) {
@@ -29,7 +31,8 @@ NativeWebKeyboardEvent::NativeWebKeyboardEvent(
     const NativeWebKeyboardEvent& other)
     : WebKeyboardEvent(other),
       os_event([other.os_event retain]),
-      skip_in_browser(other.skip_in_browser) {
+      skip_in_browser(other.skip_in_browser),
+      is_synthetic(false) {
 }
 
 NativeWebKeyboardEvent& NativeWebKeyboardEvent::operator=(
@@ -41,6 +44,7 @@ NativeWebKeyboardEvent& NativeWebKeyboardEvent::operator=(
   [previous release];
 
   skip_in_browser = other.skip_in_browser;
+  is_synthetic = other.is_synthetic;
 
   return *this;
 }