DirectWrite to not round already subpixel metrics.

src/ports/SkScalerContext_win_dw.cpp

Index: src/ports/SkScalerContext_win_dw.cpp
diff --git a/src/ports/SkScalerContext_win_dw.cpp b/src/ports/SkScalerContext_win_dw.cpp
index fa21df537c3ee6fbc9619bfd3cfe435c92cb1905..f3293bf00348d09ec8e5349461e631e4faecd8b8 100644
--- a/src/ports/SkScalerContext_win_dw.cpp
+++ b/src/ports/SkScalerContext_win_dw.cpp
@@ -288,10 +288,6 @@ void SkScalerContext_DW::generateAdvance(SkGlyph* glyph) {
                                        SkIntToScalar(gm.advanceWidth),
                                        SkIntToScalar(dwfm.designUnitsPerEm));
 
-    if (!this->isSubpixel()) {
-        advanceX = SkScalarRoundToScalar(advanceX);
-    }
-
     SkVector vecs[1] = { { advanceX, 0 } };
     if (DWRITE_MEASURING_MODE_GDI_CLASSIC == fMeasuringMode ||
         DWRITE_MEASURING_MODE_GDI_NATURAL == fMeasuringMode)