Tiimer based phase info generated for mouse wheel events.

content/browser/renderer_host/render_widget_host_view_base.cc

Index: content/browser/renderer_host/render_widget_host_view_base.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_base.cc b/content/browser/renderer_host/render_widget_host_view_base.cc
index 66e549f010161c11e45898c4d49abe7bd1451209..90b04bbd38b218f3463f2ea4612d91c16033975f 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.cc
+++ b/content/browser/renderer_host/render_widget_host_view_base.cc
@@ -16,6 +16,7 @@
 #include "content/browser/renderer_host/render_widget_host_view_frame_subscriber.h"
 #include "content/browser/renderer_host/text_input_manager.h"
 #include "content/common/content_switches_internal.h"
+#include "content/public/common/content_features.h"
 #include "media/base/video_frame.h"
 #include "ui/base/layout.h"
 #include "ui/display/screen.h"
@@ -40,6 +41,8 @@ RenderWidgetHostViewBase::RenderWidgetHostViewBase()
       current_device_scale_factor_(0),
       current_display_rotation_(display::Display::ROTATE_0),
       text_input_manager_(nullptr),
+      wheel_scroll_latching_enabled_(base::FeatureList::IsEnabled(

[bokan, 2017/05/18 16:47:00]

Why do we need to store this? Can we just query FeatureList when you need it - I
think that should be cheap?

[sahel, 2017/05/18 18:15:14]

This way we need to include the content_features.h only here and use the getter
for wheel_scroll_latching_enabled_ variable in
render_widget_host_view_event_handler.cc (two places) and
render_widget_host_view_mac.mm (two places). I can change it to direct query if
you prefer not having a new variable here.

+          features::kTouchpadAndWheelScrollLatching)),
       renderer_frame_number_(0),
       weak_factory_(this) {}