Removed clientHeight() from MediaControlsPainter.

Source/core/html/HTMLMediaElement.h

Index: Source/core/html/HTMLMediaElement.h
diff --git a/Source/core/html/HTMLMediaElement.h b/Source/core/html/HTMLMediaElement.h
index 6cdc6faf30d5ba317298a5e871fc2c74c89f502e..ff5045eec3480e9f76d2120710eb4aab6cdb7dd2 100644
--- a/Source/core/html/HTMLMediaElement.h
+++ b/Source/core/html/HTMLMediaElement.h
@@ -265,6 +265,14 @@ public:
     virtual bool isHTMLAudioElement() const { return false; }
     virtual bool isHTMLVideoElement() const { return false; }
 
+    // Notify us that we have changed layout size.  This is useful so that we
+    // can paint based on our last known size, without having to trigger a
+    // layout mid-paint.
+    void notifySizeChanged(const LayoutSize& newSize);
+
+    // Get the last known layout size that we were given by notifySizeChanged.
+    const LayoutSize& cachedLayoutSize() const { return m_cachedSize; }
+
 protected:
     HTMLMediaElement(const QualifiedName&, Document&);
     ~HTMLMediaElement() override;
@@ -620,6 +628,8 @@ private:
     friend class MediaController;
     PersistentWillBeMember<MediaController> m_mediaController;
 
+    LayoutSize m_cachedSize;
+
     friend class Internals;
     friend class TrackDisplayUpdateScope;