Add gitignore and README for Vulkan deps.

These DEPS are managed by ANGLE for its Vulkan back-end.

BUG=angleproject:1319

Review-Url: https://codereview.chromium.org/2593703003
Cr-Commit-Position: refs/heads/master@{#440230}

.gitignore

@@ -350,6 +350,7 @@ vs-chromium-project.txt
 /third_party/freetype2/src
 /third_party/gles2_conform
 /third_party/glslang/src
+/third_party/glslang-angle/src
 /third_party/gnu_binutils/
 /third_party/google_appengine_cloudstorage
 /third_party/google_toolbox_for_mac/src
@@ -442,7 +443,9 @@ vs-chromium-project.txt
 /third_party/skia
 /third_party/smhasher/src
 /third_party/snappy/src
+/third_party/spirv-headers/src
 /third_party/SPIRV-Tools/src
+/third_party/spirv-tools-angle/src
 /third_party/sqlite4java/lib/**/*.dll
 /third_party/sqlite4java/lib/**/*.jar
 /third_party/sqlite4java/lib/**/*.jnilib
@@ -456,6 +459,7 @@ vs-chromium-project.txt
 /third_party/usrsctp/usrsctplib
 /third_party/v8-i18n
 /third_party/valgrind
+/third_party/vulkan-validation-layers/src
 /third_party/v4l2capture
 /third_party/visualmetrics
 /third_party/wayland/src

third_party/glslang-angle/README.chromium

@@ -0,0 +1,10 @@
+Name: Khronos reference front-end for GLSL and ESSL
+Short Name: glslang
+URL: https://github.com/google/glslang
+Version: unknown
+Security Critical: yes
+License: MIT
+License File: LICENSE
+
+Description:
+An OpenGL and OpenGL ES shader front end and validator.

third_party/spirv-headers/README.chromium

@@ -0,0 +1,14 @@
+Name: SPIR-V Headers
+Short Name: spirv-headers
+URL: https://github.com/KhronosGroup/SPIRV-Headers.git
+Version: unknown
+Security Critical: yes
+License: MIT
+License File: LICENSE
+
+Description:
+This repository contains machine-readable files from the SPIR-V Registry. This includes:
+
+* Header files for various languages.
+* JSON files describing the grammar for the SPIR-V core instruction set, and for the GLSL.std.450 extended instruction set.
+* The XML registry file.

third_party/spirv-tools-angle/README.chromium

@@ -0,0 +1,11 @@
+Name: SPIR-V Tools
+Short Name: SPIRV-Tools
+URL: https://github.com/KhronosGroup/SPIRV-Tools.git
+Version: unknown
+Security Critical: yes
+License: MIT
+License File: LICENSE
+
+Description:
+The SPIR-V Tools project provides an API and commands for processing
+SPIR-V modules.

third_party/vulkan-validation-layers/README.chromium

@@ -0,0 +1,17 @@
+Name: Vulkan Ecosystem Components
+Short Name: Vulkan Layers SDK
+Version: unknown
+URL: https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers
+SOURCE CODE: git clone https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers.git
+Date: 06/07/2016
+Revision: d9da90d92748c37962766868f8b0354637672c2a
+Security Critical: no
+License: Apache 2.0
+License File: LICENSE.txt
+
+Description:
+The Vulkan Ecosystem Components consist of the Vulkan loader and Validation Layers SDK. The layers help
+validate Vulkan programs at runtime for development, and the loader is a utility for loading the Vulkan
+entry points and hooking them into the correct layers. These are essential for developing Vulkan
+applications.
+