Allow disabling input throttle through RendererPreference (for Browser Plugin guests)

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 489a20f71d5f661dc21a36dbe8b6d88857a5e8fd..da841be72e9a997e363708bb22451337d1ed023d 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -76,7 +76,8 @@ static const float kStandardDPI = 160;
 
 RenderWidget::RenderWidget(WebKit::WebPopupType popup_type,
                            const WebKit::WebScreenInfo& screen_info,
-                           bool swapped_out)
+                           bool swapped_out,
+                           bool disable_input_throttle)
     : routing_id_(MSG_ROUTING_NONE),
       surface_id_(0),
       webwidget_(NULL),
@@ -108,7 +109,8 @@ RenderWidget::RenderWidget(WebKit::WebPopupType popup_type,
       animation_update_pending_(false),
       invalidation_task_posted_(false),
       screen_info_(screen_info),
-      device_scale_factor_(1) {
+      device_scale_factor_(1),
+      disable_input_throttle_(disable_input_throttle) {
   if (!swapped_out)
     RenderProcess::current()->AddRefProcess();
   DCHECK(RenderThread::Get());
@@ -143,7 +145,7 @@ RenderWidget* RenderWidget::Create(int32 opener_id,
                                    const WebKit::WebScreenInfo& screen_info) {
   DCHECK(opener_id != MSG_ROUTING_NONE);
   scoped_refptr<RenderWidget> widget(
-      new RenderWidget(popup_type, screen_info, false));
+      new RenderWidget(popup_type, screen_info, false, false));

[darin (slow to review), 2012/08/07 21:54:39]

nit: it is unfortunate to have methods with lists of bool params as the
callsites become fairly unreadable.  how about just creating a setter to disable
input throttling?  set_throttle_input_events(false)

[Fady Samuel, 2012/08/07 22:17:22]

Done.

   widget->Init(opener_id);  // adds reference
   return widget;
 }
@@ -583,8 +585,9 @@ void RenderWidget::OnHandleInputEvent(const IPC::Message& message) {
       input_event->type == WebInputEvent::MouseWheel ||
       WebInputEvent::isTouchEventType(input_event->type);
   bool is_input_throttled =
-      (webwidget_ ? webwidget_->isInputThrottled() : false) ||
-      paint_aggregator_.HasPendingUpdate();
+      !disable_input_throttle_ &&
+      ((webwidget_ ? webwidget_->isInputThrottled() : false) ||
+      paint_aggregator_.HasPendingUpdate());
 
   if (event_type_gets_rate_limited && is_input_throttled && !is_hidden_) {
     // We want to rate limit the input events in this case, so we'll wait for