Implement <video controls> dodging for text track layout

Source/core/layout/LayoutTextTrackContainer.h

Index: Source/core/layout/LayoutTextTrackContainer.h
diff --git a/Source/core/layout/LayoutTextTrackContainer.h b/Source/core/layout/LayoutTextTrackContainer.h
index 0d6fb5cc4c04562da01d1621744eb51ddf21ce9a..121d4c46c47a97262ba435e789bf1b645c0f8c4b 100644
--- a/Source/core/layout/LayoutTextTrackContainer.h
+++ b/Source/core/layout/LayoutTextTrackContainer.h
@@ -40,6 +40,9 @@ class LayoutTextTrackContainer final : public LayoutBlockFlow {
 public:
     LayoutTextTrackContainer(Element*);
 
+    const IntRect& controlsRect() { return m_controlsRect; }
+    void setControlsRect(const IntRect& rect) { m_controlsRect = rect; }
+
 private:
     virtual void layout() override;
 
@@ -47,6 +50,7 @@ private:
 
     IntSize m_videoSize;
     float m_fontSize;
+    IntRect m_controlsRect;
 };
 
 } // namespace blink