Roll dawn from 949f1e45f1dc to 78f7e8640f14 (5 revisions)

https://dawn.googlesource.com/dawn.git/+log/949f1e45f1dc..78f7e8640f14

2020-05-19 enga@chromium.org Skip VulkanImageWrappingTests on SwiftShader
2020-05-19 brandon1.jones@intel.com Descriptor Residency 2: Add Management Logic and Test
2020-05-19 enga@chromium.org Skip window and surface tests if glfwInit fails
2020-05-19 yunchao.he@intel.com Fix a bug for texture subresource
2020-05-19 brandon1.jones@intel.com Descriptor Residency 1: Add Pageable and ShaderVisibleDescriptorHeap

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dawn-skia-autoroll
Please CC cwallez@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: None
Tbr: cwallez@google.com
Change-Id: I447efa3f1e7f332d0f3ef333f03a7835d2e9de45
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291017
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 35117e9..181de1c 100644
--- a/DEPS
+++ b/DEPS
@@ -10,7 +10,7 @@
   "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@fabf74bda604b693212247c960fd2dc679a42b69",
   # Dawn requires jinja2 and markupsafe for the code generator, and glslang and shaderc for SPIRV compilation.
   # When the Dawn revision is updated these should be updated from the Dawn DEPS as well.
-  "third_party/externals/dawn"            : "https://dawn.googlesource.com/dawn.git@949f1e45f1dc8c40b3ba2ba182fc7209ead09032",
+  "third_party/externals/dawn"            : "https://dawn.googlesource.com/dawn.git@78f7e8640f1452eab5a31bd07ec955b3a41d0aba",
   "third_party/externals/glslang"         : "https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang@4fa68edd68197a8c77779942b5d973f89c621752",
   "third_party/externals/jinja2"          : "https://chromium.googlesource.com/chromium/src/third_party/jinja2@b41863e42637544c2941b574c7877d3e1f663e25",
   "third_party/externals/markupsafe"      : "https://chromium.googlesource.com/chromium/src/third_party/markupsafe@8f45f5cfa0009d2a70589bcda0349b8cb2b72783",