Disable input events when a JS dialog is showing.

chrome/browser/renderer_host/render_widget_host.cc

Index: chrome/browser/renderer_host/render_widget_host.cc
diff --git a/chrome/browser/renderer_host/render_widget_host.cc b/chrome/browser/renderer_host/render_widget_host.cc
index 8328d60ed7e7f261890579db16464a13bf6ea810..996f63f124f4b5c174013a304a9ce70fece290bb 100644
--- a/chrome/browser/renderer_host/render_widget_host.cc
+++ b/chrome/browser/renderer_host/render_widget_host.cc
@@ -345,6 +345,9 @@ void RenderWidgetHost::SystemThemeChanged() {
 }
 
 void RenderWidgetHost::ForwardMouseEvent(const WebMouseEvent& mouse_event) {
+  if (process_->ignore_input_events())
+    return;
+
   // Avoid spamming the renderer with mouse move events.  It is important
   // to note that WM_MOUSEMOVE events are anyways synthetic, but since our
   // thread is able to rapidly consume WM_MOUSEMOVE events, we may get way
@@ -364,11 +367,17 @@ void RenderWidgetHost::ForwardMouseEvent(const WebMouseEvent& mouse_event) {
 
 void RenderWidgetHost::ForwardWheelEvent(
     const WebMouseWheelEvent& wheel_event) {
+  if (process_->ignore_input_events())
+    return;
+
   ForwardInputEvent(wheel_event, sizeof(WebMouseWheelEvent));
 }
 
 void RenderWidgetHost::ForwardKeyboardEvent(
     const NativeWebKeyboardEvent& key_event) {
+  if (process_->ignore_input_events())
+    return;
+
   if (key_event.type == WebKeyboardEvent::Char &&
       (key_event.windowsKeyCode == base::VKEY_RETURN ||
        key_event.windowsKeyCode == base::VKEY_SPACE)) {
@@ -398,6 +407,8 @@ void RenderWidgetHost::ForwardInputEvent(const WebInputEvent& input_event,
   if (!process_->HasConnection())
     return;
 
+  DCHECK(!process_->ignore_input_events());
+
   IPC::Message* message = new ViewMsg_HandleInputEvent(routing_id_);
   message->WriteData(
       reinterpret_cast<const char*>(&input_event), event_size);