Roll src/third_party/skia/ e839e7844..606add3df (9 commits).

https://chromium.googlesource.com/skia.git/+log/e839e78443e4..606add3dfb2f

$ git log e839e7844..606add3df --date=short --no-merges --format='%ad %ae %s'
2016-09-15 bungeman Revert of SkFontData to use smart pointers. (patchset #3 id:40001 of https://codereview.chromium.org/2339273002/ )
2016-09-15 mtklein GN: link executables with -rdynamic on Linux.
2016-09-15 bungeman SkFontData to use smart pointers.
2016-09-15 mtklein simple fix?
2016-09-15 rmistry Add ability to create and upload SVGs from a local dir
2016-09-15 borenet Fix NoGPU bot, which is compiling in GPU support
2016-09-15 brianosman Remove the unused 16-bit gradient cache
2016-09-15 brianosman More NoGPU compile fixes
2016-09-15 mtklein Pass rietveld as the default patch_storage.

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=djsollen@google.com

Review-Url: https://codereview.chromium.org/2345733002
Cr-Commit-Position: refs/heads/master@{#418924}

DEPS

@@ -36,7 +36,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': 'e839e78443e48d4ccad89059b4bc4b3d894fcfdd',
+  'skia_revision': '606add3dfb2f6d1dc3ee4921876e7c9fa01643f9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.