Media Controls: don't "cut" controls if fully hidden.

third_party/WebKit/Source/core/layout/LayoutMedia.cpp

Index: third_party/WebKit/Source/core/layout/LayoutMedia.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutMedia.cpp b/third_party/WebKit/Source/core/layout/LayoutMedia.cpp
index 1ba695f653116c3c001ae59c7f833f3de8aaba60..e85413688c4df85a8552f5c983d458e03b198e69 100644
--- a/third_party/WebKit/Source/core/layout/LayoutMedia.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutMedia.cpp
@@ -180,7 +180,10 @@ LayoutUnit LayoutMedia::computePanelWidth(const LayoutRect& mediaRect) const {
           FloatPoint(mediaRect.location()),
           UseTransforms | ApplyContainerFlip | TraverseDocumentBoundaries)
           .x());
-  DCHECK_GE(visibleWidth - absoluteXOffset, 0);
+  const LayoutUnit newWidth = visibleWidth - absoluteXOffset;
+
+  if (newWidth < 0)
+    return mediaRect.width();
 
   return std::min(mediaRect.width(), visibleWidth - absoluteXOffset);
 }