BUILD.gn: put public include dirs in all_dependent_configs

The public include dirs for Dawn were in the dawn_public config but it
would only be added to targets as a part of public_configs. This meant
that second-level dependencies that ended up needing to include
dawn/dawn.h wouldn't know where to find it.

Fixed this by adding include dirs in all_dependent_configs and renamed
the config to be very explicit that it is for include dirs only.

BUG=chromium:938895

Change-Id: Iad70f3ce1f8a02b96bf341e7dd7d6068ce645af7
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/5920
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

BUILD.gn

@@ -50,7 +50,7 @@ source_set("libdawn_native_headers") {
   public_deps = [
     "${dawn_root}/src/dawn:dawn_headers",
   ]
-  public_configs = [ "${dawn_root}/src/common:dawn_public" ]
+  all_dependent_configs = [ "${dawn_root}/src/common:dawn_public_include_dirs" ]
   sources = [
     "src/include/dawn_native/DawnNative.h",
     "src/include/dawn_native/dawn_native_export.h",

src/common/BUILD.gn

@@ -29,10 +29,10 @@ if (build_with_chromium) {
 # Common dawn configs
 ###############################################################################
 
-config("dawn_public") {
+config("dawn_public_include_dirs") {
   include_dirs = [
     "${target_gen_dir}/../..",
-    "${dawn_root}/src/include"
+    "${dawn_root}/src/include",
   ]
 }
 
@@ -60,8 +60,6 @@ config("dawn_internal") {
     defines += [ "DAWN_ENABLE_BACKEND_VULKAN" ]
   }
 
-  configs = [ ":dawn_public" ]
-
   # Only internal Dawn targets can use this config, this means only targets in
   # this BUILD.gn file.
   visibility = [ ":*" ]
@@ -96,7 +94,7 @@ if (is_win || is_linux || is_mac) {
       "vulkan_platform.h",
       "windows_with_undefs.h",
     ]
-  
+
     configs += [ ":dawn_internal" ]
     deps = [
       "${dawn_root}/src/dawn:dawn_headers",

src/dawn/BUILD.gn

@@ -35,7 +35,7 @@ dawn_generator("dawn_headers_gen") {
 }
 
 source_set("dawn_headers") {
-  public_configs = [ "${dawn_root}/src/common:dawn_public" ]
+  all_dependent_configs = [ "${dawn_root}/src/common:dawn_public_include_dirs" ]
   deps = [
     ":dawn_headers_gen",
   ]

src/dawn_wire/BUILD.gn

@@ -27,7 +27,7 @@ source_set("libdawn_wire_headers") {
   public_deps = [
     "${dawn_root}/src/dawn:dawn_headers",
   ]
-  public_configs = [ "${dawn_root}/src/common:dawn_public" ]
+  all_dependent_configs = [ "${dawn_root}/src/common:dawn_public_include_dirs" ]
   sources = [
     "${dawn_root}/src/include/dawn_wire/Wire.h",
     "${dawn_root}/src/include/dawn_wire/WireClient.h",