Rolling 2 dependencies

Roll src/third_party/shaderc/src/ 1db568ebb..486655782 (1 commit)

https://chromium.googlesource.com/external/github.com/google/shaderc.git/+log/1db568ebb1f0..486655782f8b

$ git log 1db568ebb..486655782 --date=short --no-merges --format='%ad %ae %s'
2020-03-31 rharrison Add knob to control force_zero_initialized_variables (#1028)

Roll src/third_party/spirv-cross/spirv-cross/ 172e39f03..e58e8d5db (40 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Cross.git/+log/172e39f0398b..e58e8d5dbe03

$ git log 172e39f03..e58e8d5db --date=short --no-merges --format='%ad %ae %s'
2020-03-31 post MSL: Fix access chain for deep struct hierarchy on array of buffers.
2020-03-30 dsinclair Roll GLSLang, SPIRV-Tools and SPIRV-Headers
2020-03-26 post Add support for forcefully zero-initialized variables.
2020-03-19 post GLSL: Implement GL_EXT_shader_framebuffer_fetch.
2020-03-19 post Run format_all.sh.
2020-03-19 post GLSL/HLSL: Fix nonuniform qualifier for SSBO atomics.
2020-03-19 post GLSL/HLSL: Implement nonuniform qualifier for image atomics.
2020-03-10 post include/spirv_cross: Fix typo.
2020-03-05 post HLSL: Do not emit globallycoherent for SRV ByteAddressBuffer.
2020-03-04 post Add test for disable-storage-image-qualifier-deduction.
2020-03-04 post HLSL: Add option to always treat SSBO as UAV, even with readonly.
2020-03-04 post Add option to disable storage image qualifier deduction.
2020-03-04 post Remove old hack which forces NonWritable/NonReadable.
2020-03-02 post Add -V alias for --vulkan-semantics.
2020-02-24 post MSL: Add C API for force native arrays.
2020-02-24 post MSL: Add native array test for composite array initialization.
2020-02-24 post MSL: Reintroduce workaround for constant arrays being passed by value.
2020-02-24 post MSL: Reinstate workaround for returning arrays.
2020-02-24 post MSL: Add a workaround path to force native arrays for everything.
2020-02-19 dsinclair Roll GLSLang, SPIRV-Tools and SPIRV-Headers
2020-02-14 post Reject SPIR-V modules with garbage ID bound.
2020-02-08 post HLSL: Declare undef variables as static.
2020-02-06 post Remove old memory_scope flag from iOS barriers.
2020-02-03 post Use GNUInstallDirs for include path as well.
2020-02-01 orbea cmake: Don't hardcode the pkg-config file.
2020-02-01 orbea cmake: Use GNUInstallDirs.
2020-02-01 post CMake: Avoid warning when parent project uses VERSION in project().
2020-01-27 post Compile fix on older compilers.
2020-01-27 post GLSL: Support GL_ARB_enchanced_layouts for XFB.
2020-01-25 cdavis MSL: Move inline uniform blocks to the end of the argument buffer.
2019-12-16 cdavis MSL: Support inline uniform blocks in argument buffers.
2020-01-23 post Make SmallVector noexcept.
2020-01-22 42098783+barath121 Typo at line 324
2020-01-16 post Update license headers to 2020.
2020-01-16 post Run format_all.sh.
2020-01-16 post MSL: Add support for force-activating IAB resources.
2020-01-16 post Deal with illegal names in types as well.
2020-01-15 post Reflection: Add array stride/matrix stride reflection.
2020-01-15 post Reflection: Emit reflection information for array size literalness.
2020-01-15 post GLSL: Implement geometry shader passthrough extension.

Created with:
  roll-dep src/third_party/shaderc/src src/third_party/spirv-cross/spirv-cross

Change-Id: I77642e3f04f1fd9ddd52962b324876f352680f4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132850
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755492}

DEPS

@@ -294,11 +294,11 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'spirv_cross_revision': '172e39f0398b920cfc221b7826c92105d44ad647',
+  'spirv_cross_revision': 'e58e8d5dbe03ea2cc755dbaf43ffefa1b8d77bef',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'shaderc_revision': '1db568ebb1f0efbf72cc94795d13c9bf8e126406',
+  'shaderc_revision': '486655782f8b8a4f04420d8452c2138da373956f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.