Revert "Remove devKerning"

This reverts commit c86c5c0144b85d0bc8ec791f9609ee2d4e7d835a.

Reason for revert: 4 of 5

Original change's description:
> Remove devKerning
> 
> Dev kerning is not supported by any scalers. This is
> mostly removed. The remaining fields fRsbDelta and
> fLsbDelta are kept to keep Android compiling.
> 
> Change-Id: If1a9ee9bb599d4e1bdf4b3751ac0c65246350809
> Reviewed-on: https://skia-review.googlesource.com/124921
> Reviewed-by: Ben Wagner <bungeman@google.com>
> Commit-Queue: Herb Derby <herb@google.com>

TBR=bungeman@google.com,herb@google.com,reed@google.com

Change-Id: If865f702868192a1b72cd811baa996dd1282bbce
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/125263
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/ports/SkScalerContext_win_dw.cpp b/src/ports/SkScalerContext_win_dw.cpp
index 98d8ca812e..8e73b16047 100644
--- a/src/ports/SkScalerContext_win_dw.cpp
+++ b/src/ports/SkScalerContext_win_dw.cpp
@@ -377,6 +377,12 @@ uint16_t SkScalerContext_DW::generateCharToGlyph(SkUnichar uni) {
 }
 
 void SkScalerContext_DW::generateAdvance(SkGlyph* glyph) {
+    //Delta is the difference between the right/left side bearing metric
+    //and where the right/left side bearing ends up after hinting.
+    //DirectWrite does not provide this information.
+    glyph->fRsbDelta = 0;
+    glyph->fLsbDelta = 0;
+
     glyph->fAdvanceX = 0;
     glyph->fAdvanceY = 0;