Refactor the current text position update in SVGTextLayoutEngine

third_party/WebKit/LayoutTests/TestExpectations

 # ====== Oilpan-only failures from here ======
 # Most of these actually cause the tests to report success, rather than
 # failure. Expected outputs will be adjusted for the better once Oilpan
 # has been well and truly enabled always.
 
 # With Oilpan, the parent pointer in the CSSRule hierarchy is
 # strong. This is the intended behavior.
 crbug.com/345630 fast/dom/StyleSheet/gc-parent-rule.html [ Failure ]
 crbug.com/345630 fast/dom/StyleSheet/gc-parent-stylesheet.html [ Failure ]
 crbug.com/345655 fast/dom/StyleSheet/detached-parent-rule-without-wrapper.html [ Failure ]
@@ skipping 89 matching lines @@
 crbug.com/537172 [ Win10 ] virtual/spv2/paint/invalidation/spv2/background-image-paint-invalidation.html [ Failure ]
 crbug.com/564443 [ Mac10.9 Mac10.10 Win7 Linux ] virtual/spv2/paint/invalidation/spv2/background-image-paint-invalidation.html [ Failure Pass ]
 
 crbug.com/504613 crbug.com/524248 paint/images/image-backgrounds-not-antialiased.html [ Skip ]
 crbug.com/504613 crbug.com/524248 virtual/spv2/paint/images/image-backgrounds-not-antialiased.html [ Skip ]
 crbug.com/502531 fast/borders/border-antialiasing.html [ Failure ]
 
 crbug.com/538697 [ Win7 Debug ] virtual/threaded/printing/webgl-oversized-printing.html [ Crash ]
 crbug.com/538697 [ Win7 Debug ] printing/webgl-oversized-printing.html [ Crash ]
 
+crbug.com/486669 svg/batik/text/textOnPath2.svg [ NeedsRebaseline ]

[pdr., 2016/04/14 01:05:51]

Can you double-check that this isn't a regression? It's hard to say what should
happen here, but the new behavior differs from the batik expectations.

[fs, 2016/04/14 08:56:42]

I have, and I think this is a progression. (In my reading of the spec,
text-on-a-path layout should not have any effect on the current text position.
The new rendering/behavior matches Gecko [and Presto - so, yes, I'm biased...])

[fs, 2016/04/14 09:04:43]

(I should probably also mention the "ulterior motives", which is to avoid
fragmentation for text-paths [or at least do it as a deferred pass] to be able
to better support BiDi - and possibly even let Skia do the path-mapping [which
would allow us to support 'stretch' somewhat efficiently.])

+crbug.com/486669 svg/batik/text/verticalTextOnPath.svg [ NeedsRebaseline ]
+
 # Expected to fail until OffscreenCanvas can render on the gpu
 crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-strokeRect-in-worker.html [ Failure ]
 crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-paths-in-worker.html [ Failure ]
 crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-transform-shadow-in-worker.html [ Failure ]
 
 crbug.com/417782 [ Linux Win ] virtual/rootlayerscrolls/fast/scrolling/fractional-scroll-offset-fixed-position-non-composited.html [ Failure ]
 crbug.com/492664 [ Linux ] imported/csswg-test/css-writing-modes-3/box-offsets-rel-pos-vlr-005.xht [ Failure ]
 crbug.com/492664 [ Linux ] imported/csswg-test/css-writing-modes-3/box-offsets-rel-pos-vrl-004.xht [ Failure ]
 crbug.com/492664 [ Mac ] imported/csswg-test/css-writing-modes-3/bidi-embed-002.html [ Failure ]
 crbug.com/492664 [ Mac ] imported/csswg-test/css-writing-modes-3/bidi-isolate-002.html [ Failure ]
@@ skipping 1417 matching lines @@
 crbug.com/593679 virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
 crbug.com/593679 virtual/scalefactor200/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
 crbug.com/593679 virtual/scalefactor200withzoom/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
 
 crbug.com/600248 imported/web-platform-tests/web-animations/keyframe-effect/getComputedTiming-progress.html [ Crash ]
 crbug.com/600248 imported/web-platform-tests/web-animations/keyframe-effect/getComputedTiming-currentIteration.html [ Crash ]
 crbug.com/600248 imported/web-platform-tests/web-animations/animation-effect-timing/endDelay.html [ Failure ]
 crbug.com/600248 imported/web-platform-tests/web-animations/animation/constructor.html [ Failure Timeout ]
 crbug.com/600248 imported/web-platform-tests/web-animations/animation-node/idlharness.html [ Failure Timeout ]