Roll src/third_party/skia/ dfed06f6f..dec294375 (7 commits).
Roll src/third_party/skia/ dfed06f6f..dec294375 (7 commits).

https://chromium.googlesource.com/skia.git/+log/dfed06f6ff5a..dec294375ad6

$ git log dfed06f6f..dec294375 --date=short --no-merges --format='%ad %ae %s'
2016-03-28 bsalomon Remove the GrGLInterface callback mechanism. GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1836013002
2016-03-28 benjaminwagner Remove advance[XY]Fixed getters.
2016-03-28 egdaniel Use NV glsl shader compiler for Vulkan
2016-03-28 halcanary SkPDF: PDFDevice::ContentEntry now implemented with SinglyLinkedList
2016-03-28 abarth Add GLFW support for GrGLCreateNativeInterface
2016-03-28 bungeman Remove SK_IGNORE_MAC_FONT_WEIGHT_FIX.
2016-03-28 robertphillips Temporary fix for --preAbandonGpuContext bug

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=djsollen@google.com

Review URL: https://codereview.chromium.org/1835343002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#383560}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk