Don't change layout size due to top control show/hide

third_party/WebKit/Source/core/css/CSSToLengthConversionData.cpp

Index: third_party/WebKit/Source/core/css/CSSToLengthConversionData.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSToLengthConversionData.cpp b/third_party/WebKit/Source/core/css/CSSToLengthConversionData.cpp
index a3c732e76462eca123abe0a46af7f6eb91b38f68..e1e4e0dd0935ad9f83a7339c00ebf56186e07234 100644
--- a/third_party/WebKit/Source/core/css/CSSToLengthConversionData.cpp
+++ b/third_party/WebKit/Source/core/css/CSSToLengthConversionData.cpp
@@ -68,8 +68,8 @@ float CSSToLengthConversionData::FontSizes::ch() const
 }
 
 CSSToLengthConversionData::ViewportSize::ViewportSize(const LayoutView* layoutView)
-    : m_width(layoutView ? layoutView->layoutViewportWidth() : 0)
-    , m_height(layoutView ? layoutView->layoutViewportHeight() : 0)
+    : m_width(layoutView ? layoutView->viewportSizeForViewportUnits().width() : 0)

[jbroman, 2016/01/20 15:44:28]

viewportSizeForViewportUnits seems not free to do twice. Why not store a
DoubleSize internally, and then construct it as:

: m_size(layoutView ? layoutView->viewportSizeForViewportUnits() : 0)

[bokan, 2016/01/20 16:41:10]

Done.

+    , m_height(layoutView ? layoutView->viewportSizeForViewportUnits().height() : 0)
 {
 }