Rename transformToRoot:ish names to screenScaleFactorChanged:ish ones

third_party/WebKit/Source/core/layout/svg/LayoutSVGContainer.cpp

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGContainer.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGContainer.cpp b/third_party/WebKit/Source/core/layout/svg/LayoutSVGContainer.cpp
index b53b91aba26d2a76dad73ceb8d491fd865e5b25a..93b8116375fcfa49429f2c9339baf9c0f80fc50f 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGContainer.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGContainer.cpp
@@ -36,7 +36,7 @@ LayoutSVGContainer::LayoutSVGContainer(SVGElement* node)
     : LayoutSVGModelObject(node)
     , m_objectBoundingBoxValid(false)
     , m_needsBoundariesUpdate(true)
-    , m_didTransformToRootUpdate(false)
+    , m_didScreenScaleFactorChange(false)
     , m_hasNonIsolatedBlendingDescendants(false)
     , m_hasNonIsolatedBlendingDescendantsDirty(false)
 {
@@ -56,7 +56,7 @@ void LayoutSVGContainer::layout()
 
     // Allow LayoutSVGTransformableContainer to update its transform.
     bool updatedTransform = calculateLocalTransform();
-    m_didTransformToRootUpdate = updatedTransform || SVGLayoutSupport::transformToRootChanged(parent());
+    m_didScreenScaleFactorChange = updatedTransform || SVGLayoutSupport::screenScaleFactorChanged(parent());

[f(malita), 2016/04/20 20:00:32]

If we only care about scale factor changes, then this looks too conservative.  I
presume we could do something smart about it (only track actual scale changes),
or tweak the name to reflect the current reality:
s/screenScaleChanged/screenTransformChanged/

I'm fine with landing as-is too, if the plan is to fix reality later :)

[fs, 2016/04/20 20:18:20]

Right, it was "undisclosed" that I intend to make this less conservative by
replacing the "updatedTransform" bit with something tighter in a follow-up CL.

 
     // LayoutSVGViewportContainer needs to set the 'layout size changed' flag.
     determineIfLayoutSizeChanged();
@@ -71,7 +71,7 @@ void LayoutSVGContainer::layout()
     // the descendants.
     bool forceLayoutOfChildren = selfNeedsLayout()
         || (normalChildNeedsLayout() && SVGLayoutSupport::hasFilterResource(*this));
-    SVGLayoutSupport::layoutChildren(firstChild(), forceLayoutOfChildren, m_didTransformToRootUpdate, layoutSizeChanged);
+    SVGLayoutSupport::layoutChildren(firstChild(), forceLayoutOfChildren, m_didScreenScaleFactorChange, layoutSizeChanged);
 
     // Invalidate all resources of this client if our layout changed.
     if (everHadLayout() && needsLayout())