Media Controls: move timeline related code to modules.

third_party/WebKit/Source/modules/media_controls/elements/MediaControlElementsHelper.cpp

Index: third_party/WebKit/Source/modules/media_controls/elements/MediaControlElementsHelper.cpp
diff --git a/third_party/WebKit/Source/modules/media_controls/elements/MediaControlElementsHelper.cpp b/third_party/WebKit/Source/modules/media_controls/elements/MediaControlElementsHelper.cpp
index 0734977ad76573ce802bb42cb2b978b492752beb..554ed41da98a14dcef0c5b603006bc57ae89e372 100644
--- a/third_party/WebKit/Source/modules/media_controls/elements/MediaControlElementsHelper.cpp
+++ b/third_party/WebKit/Source/modules/media_controls/elements/MediaControlElementsHelper.cpp
@@ -5,6 +5,7 @@
 #include "modules/media_controls/elements/MediaControlElementsHelper.h"
 
 #include "core/events/Event.h"
+#include "core/layout/api/LayoutSliderItem.h"
 
 namespace blink {
 
@@ -16,4 +17,33 @@ bool MediaControlElementsHelper::IsUserInteractionEvent(Event* event) {
          event->IsKeyboardEvent() || event->IsTouchEvent();
 }
 
+// static
+bool MediaControlElementsHelper::IsUserInteractionEventForSlider(
+    Event* event,
+    LayoutObject* layout_object) {
+  // It is unclear if this can be converted to isUserInteractionEvent(), since
+  // mouse* events seem to be eaten during a drag anyway, see
+  // https://crbug.com/516416.
+  if (IsUserInteractionEvent(event))
+    return true;
+
+  // Some events are only captured during a slider drag.
+  const LayoutSliderItem& slider =
+      LayoutSliderItem(ToLayoutSlider(layout_object));
+  // TODO(crbug.com/695459#c1): LayoutSliderItem::inDragMode is incorrectly
+  // false for drags that start from the track instead of the thumb.
+  // Use SliderThumbElement::m_inDragMode and
+  // SliderContainerElement::m_touchStarted instead.
+  if (!slider.IsNull() && !slider.InDragMode())
+    return false;
+
+  const AtomicString& type = event->type();
+  return type == EventTypeNames::mouseover ||
+         type == EventTypeNames::mouseout ||
+         type == EventTypeNames::mousemove ||
+         type == EventTypeNames::pointerover ||
+         type == EventTypeNames::pointerout ||
+         type == EventTypeNames::pointermove;
+}
+
 }  // namespace blink