Roll src/third_party/skia/ c0444615e..e7904f397 (4 commits).

https://chromium.googlesource.com/skia.git/+log/c0444615ed76..e7904f3979e2

$ git log c0444615e..e7904f397 --date=short --no-merges --format='%ad %ae %s'
2016-09-16 mtklein Flesh out GN/Android run docs.
2016-09-16 halcanary SkPDF:  Implement /ActualText to make text extraction correct.
2016-09-16 rmistry Revert of Run SVGs through nanobench on all Perf bots (patchset #5 id:120001 of https://codereview.chromium.org/2343903002/ )
2016-09-16 mtklein Is it just me or is this logging just noise?

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

Review-Url: https://codereview.chromium.org/2334223013
Cr-Commit-Position: refs/heads/master@{#419275}

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': 'c0444615ed76360f680619ad4d1f92cda6181a50',
+  'skia_revision': 'e7904f3979e2e8b80b5d77165291e649ff1278dd',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.