Reland "Add deps to enable performing the cmake build of dawn_node on CQ"

This is a reland of ecbdd8fbe7
It prefixes the DEPS variables with "dawn_". Because they are globals,
they may collide with other variables in other projects.

Original change's description:
> Add deps to enable performing the cmake build of dawn_node on CQ
>
> (and the cmake build of Dawn in general)
>
> Bug: dawn:688
> Change-Id: If7c037a03d237372739aed1f5dc78bffb7975a24
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/65603
> Reviewed-by: Ben Clayton <bclayton@google.com>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Austin Eng <enga@chromium.org>

Bug: dawn:688
Change-Id: I81ec3d5298efea54b1417ff58569cf1c615ea372
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/66400
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>

src/dawn_node/CMakeLists.txt

@@ -41,7 +41,7 @@ function(idlgen)
         message(FATAL_ERROR "idlgen() missing IDLS argument(s)")
     endif()
     add_custom_command(
-        COMMAND "go" "run" "main.go"
+        COMMAND ${GO_EXECUTABLE} "run" "main.go"
                 "--template" "${IDLGEN_TEMPLATE}"
                 "--output"   "${IDLGEN_OUTPUT}"
                 ${IDLGEN_IDLS}